Ido language

Ido /ˈiːdoʊ/ is a constructed language, derived from Reformed Esperanto, created to be a universal second language for speakers of diverse backgrounds. Ido was specifically designed to be grammatically, orthographically, and lexicographically regular, and above all easy to learn and use. In this sense, Ido is classified as a constructed international auxiliary language. It is the most successful of many Esperanto derivatives, called Esperantidos.

Ido was created in 1907 out of a desire to reform perceived flaws in Esperanto, a language that had been created 20 years earlier to facilitate international communication. The name of the language traces its origin to the Esperanto word ido, meaning "offspring",[2] since the language is a "descendant" of Esperanto. After its inception, Ido gained support from some in the Esperanto community, but following the sudden death in 1914 of one of its most influential proponents, Louis Couturat, it declined in popularity. There were two reasons for this: first, the emergence of further schisms arising from competing reform projects; and second, a general lack of awareness of Ido as a candidate for an international language. These obstacles weakened the movement and it was not until the rise of the Internet that it began to regain momentum.

Ido uses the same 26 letters as the English (Latin) alphabet, with no diacritics. It draws its vocabulary from English, French, German, Italian, Latin, Russian, Spanish and Portuguese, and is largely intelligible to those who have studied Esperanto.

Several works of literature have been translated into Ido,[3] including The Little Prince[4] and the Gospel of Luke.[5] As of the year 2000, there were approximately 100–200 Ido speakers in the world.[1]

Flag of Ido (new)
PronunciationIPA: [ˈido]
Created byDelegation for the Adoption of an International Auxiliary Language
Setting and usageInternational auxiliary language
Users100–200 (2000)[1]
Sourcesbased on Esperanto1894
Official status
Regulated byUniono por la Linguo Internaciona Ido
Language codes
ISO 639-1io
ISO 639-2ido
ISO 639-3ido


The idea of a universal second language is not new, and constructed languages are not a recent phenomenon. The first known constructed language was Lingua Ignota, created in the 12th century. But the idea did not catch on in large numbers until the language Volapük was created in 1879. Volapük was popular for some time and apparently had a few thousand users, but was later eclipsed by the popularity of Esperanto, which arose in 1887. Several other languages such as Latino sine Flexione and Idiom Neutral had also been put forward. It was during this time that French mathematician Louis Couturat formed the Delegation for the Adoption of an International Auxiliary Language.

This delegation made a formal request to the International Association of Academies in Vienna to select and endorse an international language; the request was rejected in May 1907.[6] The Delegation then met as a Committee in Paris in October 1907 to discuss the adoption of a standard international language. Among the languages considered was a new language anonymously submitted at the last moment (and therefore against the Committee rules) under the pen name Ido.[7] In the end the Committee, always without plenary sessions and consisting of only 12 members, concluded the last day with 4 votes for and 1 abstention. They concluded that no language was completely acceptable, but that Esperanto could be accepted "on condition of several modifications to be realized by the permanent Commission in the direction defined by the conclusions of the Report of the Secretaries [Louis Couturat and Léopold Leau] and by the Ido project".[8]

Ido Kongreso en Dessau 1922
The International Ido Congress in Dessau, Germany, in 1922

Esperanto's inventor, L. L. Zamenhof, having heard a number of complaints, had suggested in 1894 a proposal for a Reformed Esperanto with several changes that Ido adopted and made it closer to French: eliminating the accented letters and the accusative case, changing the plural to an Italianesque -i, and replacing the table of correlatives with more Latinate words. However, the Esperanto community voted and rejected Reformed Esperanto,[7] and likewise most rejected the recommendations of the 1907 Committee composed by 12 members. Zamenhof deferred to their judgment, although doubtful. Furthermore, controversy ensued when the "Ido project" was found to have been primarily devised by Louis de Beaufront, whom Zamenhof had chosen to represent Esperanto before the Committee, as the Committee's rules dictated that the creator of a submitted language could not defend it.[9] The Committee's language was French and not everyone could speak in French. When the president of the Committee asked who was the author of Ido's project, Couturat, Beaufront and Leau answered that they were not. Beaufront was the person who presented Ido's project and gave a description as a better, richer version of Esperanto. Couturat, Leau, Beaufront and Jespersen were finally the only members who voted, all of them for Ido's project. A month later, Couturat accidentally put Jespersen in a copy of a letter in which he acknowledged that Beaufront was the author of the Ido project. Jespersen was angered by this and asked for a public confession, which was never forthcoming.

It is estimated that some 20% of Esperanto leaders and 3–4% of ordinary Esperantists defected to Ido, which from then on suffered constant modifications seeking to perfect it, but which ultimately had the effect of causing many Ido speakers to give up on trying to learn it.[10] Although it fractured the Esperanto movement, the schism gave the remaining Esperantists the freedom to concentrate on using and promoting their language as it stood.[11] At the same time, it gave the Idists freedom to continue working on their own language for several more years before actively promoting it. The Uniono di la Amiki di la Linguo Internaciona (Union of Friends of the International Language) was established along with an Ido Academy to work out the details of the new language.[7]

Couturat, who was the leading proponent of Ido, was killed in an automobile accident in 1914.[7] This, along with World War I, practically suspended the activities of the Ido Academy from 1914 to 1920.[6] In 1928 Ido's major intellectual supporter, the Danish linguist Otto Jespersen, published his own planned language, Novial. His defection from the Ido movement set it back even further.[12]

Digital era

The language still has active speakers today, and the Internet has sparked a renewal of interest in the language in recent years. A sample of 24 Idists on the Yahoo! group Idolisto during November 2005 showed that 57% had begun their studies of the language during the preceding three years, 32% from the mid-1990s to 2002, and 8% had known the language from before.[13]


Few changes have been made to Ido since 1922.[14]

Camiel de Cock was named secretary of linguistic issues in 1990, succeeding Roger Moureaux.[15] He resigned after the creation of a linguistic committee in 1991.[16] De Cock was succeeded by Robert C. Carnaghan, who held the position from 1992 to 2008. No new words were adopted between 2001 and 2006.[17] Following the 2008–2011 elections of ULI's direction committee, Gonçalo Neves replaced Carnaghan as secretary of linguistic issues in February 2008.[18] Neves resigned in August 2008.[19] A new linguistic committee was formed in 2010.[20][21][22] In April 2010, Tiberio Madonna was appointed as secretary of linguistic issues, succeeding Neves.[23][24] In January 2011, ULI approved eight new words.[25] This was the first addition of words in many years.[26] As of April 2012, the secretary of linguistic issues remains Tiberio Madonna.[27]


Ido has five vowel phonemes. The vowels e and ɛ are interchangeable depending on speaker preference, as are o and ɔ. The combinations /au/ and /eu/ become diphthongs in word roots but not when adding affixes.[28]

Ido vowels
Front Back
Close i u
Mid e ~ ɛ o ~ ɔ
Open a
Ido consonants
Labial Alveolar Post-
Palatal Velar Glottal
Nasal m n
Stop p b t d k ɡ
Affricate t͡s t͡ʃ
Fricative f v s z ʃ ʒ h
Approximant l j w
Flap ɾ

All polysyllabic words are stressed on the second-to-last syllable except for verb infinitives, which are stressed on the last syllable – skolo, kafeo and lernas for "school", "coffee" and the present tense of "to learn", but irar, savar and drinkar for "to go", "to know" and "to drink". If an i or u precedes another vowel, the pair is considered part of the same syllable when applying the accent rule – thus radio, familio and manuo for "radio", "family" and "hand", unless the two vowels are the only ones in the word, in which case the "i" or "u" is stressed: dio, frua for "day" and "early".[29]


Ido uses the same 26 letters as the English alphabet and ISO Basic Latin alphabet with three digraphs and no ligatures or diacritics. Where the table below lists two pronunciations, either is perfectly acceptable.[30]

Letter IPA English
a /a/ most similar to a as in "father"
b /b/ b as in "stable"
c /t͡s/ ts as in "cats"; also used in the digraph ch
d /d/ d as in "adopt"
e /e/, /ɛ/ most similar to e as in "egg" or e as in "bet"
f /f/ f as in "afraid"
g /ɡ/ hard g as in "go"
h /h/ h as in "hat", "ahoy"
i /i/ i as in "machine", ee in "bee"
j /ʒ/, /d͡ʒ/ s as in "pleasure, measure" or g in "mirage, beige"
k /k/ k as in "skin, skip"
l /l/ most similar to l as in "lamb"
m /m/ m as in "admit"
n /n/ n as in "analogy"
o /o/, /ɔ/ most similar to o as in "or"
p /p/ p as in "spin, spark"
q /k/ same as k; used only in the digraph qu
r /ɾ/ tt as in American English "butter", or r as in very in Scottish English and heightened RP, see Pronunciation of English /r/
s /s/ s as in "east"; also used in the digraph sh
t /t/ t as in "stake, stop"
u /u/ u as in "rude"
v /v/ v as in "avoid"
w /w/ w as in "award"
x /ks/, /ɡz/ x as in "except" or "exist"
y /j/ y as in "yes"
z /z/ z as in "zebra"

The digraphs are:[30]

Digraph IPA English
ch /t͡ʃ/ ch as in "chick"
qu /kw/, /kv/ qu as in "quick"
sh /ʃ/ sh as in "shy"


The definite article is "la" and is invariable. The indefinite article (a/an) does not exist in Ido. Each word in the Ido vocabulary is built from a root word. A word consists of a root and a grammatical ending. Other words can be formed from that word by removing the grammatical ending and adding a new one, or by inserting certain affixes between the root and the grammatical ending.

Some of the grammatical endings are defined as follows:

Grammatical form Ido English Esperanto
Singular noun -o (libro) book -o (libro)
Plural noun -i (libri) books -oj (libroj)
Adjective -a (varma) warm -a (varma)
Adverb -e (varme) warmly -e (varme)
Present tense infinitive -ar (irar) to be going to go -anti (iranti) -i (iri)
Past tense infinitive -ir (irir) to have gone -inti (irinti)
Future tense infinitive -or (iror) to be going to go -onti (ironti)
Present -as (iras) go, goes -as (iras)
Past -is (iris) went -is (iris)
Future -os (iros) will go -os (iros)
Imperative -ez (irez) go! -u (iru)
Conditional -us (irus) would go -us (irus)

These are the same as in Esperanto except for -i, -ir, -ar, -or and -ez. Esperanto marks noun plurals by an agglutinative ending -j (so plural nouns end in -oj), uses -i for verb infinitives (Esperanto infinitives are tenseless), and uses -u for the imperative. Verbs in Ido, as in Esperanto, do not conjugate depending on person, number or gender; the -as, -is, and -os endings suffice whether the subject is I, you, he, she, they, or anything else. For the word "to be," Ido allows either "esas" or "es" in the present tense; however, the full forms must be used for the past tense "esis" and future tense "esos." Adjectives and adverbs are compared in Ido by means of the words plu = more, maxim = most, min = less, minim = least, kam = than/as. There exists in Ido a triple category of adverbs: the simple, the derived, and the composed. The simple adverbs do not need special endings, for example: tre = very, tro = too, olim =formerly, nun = now, nur = only. The derived and composed adverbs, not being originally adverbs but derived from nouns, adjectives and verbs, have the ending -e.


Ido word order is generally the same as English (subject–verb–object), so the sentence Me havas la blua libro is the same as the English "I have the blue book", both in meaning and word order. There are a few differences, however:

  • Adjectives can precede the noun as in English, or follow the noun as in Spanish. Thus, Me havas la libro blua means the same thing.
  • Ido has the accusative suffix -n. Unlike Esperanto, this suffix is only required when the object of the sentence is not clear, for example, when the subject-verb-object word order is not followed. Thus, La blua libron me havas also means the same thing.

Ido generally does not impose rules of grammatical agreement between grammatical categories within a sentence. For example, the verb in a sentence is invariable regardless of the number and person of the subject. Nor must the adjectives be pluralized as well the nouns – in Ido the large books would be la granda libri as opposed to the French les grands livres or the Esperanto la grandaj libroj.

Negation occurs in Ido by simply adding ne before a verb: Me ne havas libro means "I do not have a book". This as well does not vary, and thus the "I do not", "He does not", "They do not" before a verb are simply Me ne, Il ne, and Li ne. In the same way, past tense and future tense negatives are formed by ne before the conjugated verb. "I will not go" and "I did not go" become Me ne iros and Me ne iris respectively.

Yes/no questions are formed by the particle ka in front of the question. "I have a book" (me havas libro) becomes Ka me havas libro? (do I have a book?). Ka can also be placed in front of a noun without a verb to make a simple question, corresponding to the English "is it?" Ka Mark? can mean, "Are you Mark?", "Is it Mark?", "Do you mean Mark?" depending on the context.


The pronouns of Ido were revised to make them more acoustically distinct than those of Esperanto, which all end in i. Especially the singular and plural first-person pronouns mi and ni may be difficult to distinguish in a noisy environment, so Ido has me and ni instead. Ido also distinguishes between intimate (tu) and formal (vu) second-person singular pronouns as well as plural second-person pronouns (vi) not marked for intimacy. Furthermore, Ido has a pan-gender third-person pronoun lu (it can mean "he", "she", or "it", depending on the context) in addition to its masculine (il), feminine (el), and neuter (ol) third-person pronouns.

singular plural reflexive indefinite
first second third first second third
familiar formal masculine feminine neuter pan-gender masculine feminine neuter pan-gender
Ido me tu vu il(u) el(u) ol(u) lu ni vi ili eli oli li su on(u)
English I thou you he she it we you they one
Esperanto mi ci¹ vi¹ li ŝi ĝi ni vi ili si oni
  1. ci, although technically the familiar form of the word "you" in Esperanto, is seldom used. Esperanto's inventor himself did not include the pronoun in the first book on Esperanto and only later reluctantly; later he recommended against using ci because different cultures have conflicting traditions regarding the use of the familiar and formal forms of "you".[31]

It should be noted that ol, like English it and Esperanto ĝi, is not limited to inanimate objects, but can be used "for entities whose sex is indeterminate: babies, children, humans, youths, elders, people, individuals, horses, [cattle], cats, etc."

Lu is often mistakenly labeled an epicene pronoun, that is, one that refers to both masculine and feminine beings, but in fact, lu is more properly a "pan-gender" pronoun, as it is also used for referring to inanimate objects. From Kompleta Gramatiko Detaloza di la Linguo Internaciona Ido by Beaufront:

Lu (like li) is used for all three genders. That lu does duty for the three genders at will in the singular is not in itself any more astonishing than seeing li serve the three genders at will in the plural ... By a decision (1558) the Idist Academy rejected every restriction concerning the use of lu. One may thus use that pronoun in exactly the same way for a thing and a person of obvious sex as for animals of unknown sex and a person that has a genderless name, like baby, child, human, etc., these being as truly masculine as feminine.

The motives for this decision were given in "Mondo", XI, 68: Lu for the singular is exactly the same as li for the plural. Logic, symmetry and ease demand this. Consequently, just as li may be used for people, animals, and things whenever nothing obliges one to express the gender, so lu may be used for people, animals, and things under the same condition. The proposed distinction would be a bothersome subtlety ...

Table of correlatives

Ido makes correlatives by combining entire words together and changing the word ending, with some irregularities to show distinction.

Relative and


Demonstrative Indeterminate Most


Negative Collective
qua, ∅ ita, ∅ ula, ∅ irga nula omna
Individual -u qua ita 1 ulu irgu nulu omnu
Thing -o quo ito 1 ulo irgo nulo omno
Plural -i qui iti 1 uli irgi nuli omni
Adjective -a qua ita 1 ula irga nula omna
Motive pro pro quo pro to pro ulo pro irgo pro nulo pro omno
Place loke ube ibe ulaloke irgaloke nulaloke omnaloke
Time tempe kande lore ulatempe 2 irgatempe nulatempe 2 sempre 3
Quality -a, speca quala tala ulaspeca 2 irgaspeca nulaspeca 2 omnaspeca
Manner -e, maniere quale tale ule, ulamaniere 2 irge, irgamaniere nule, nulamaniere 2 omne, omnamaniere
Quantity -


quanta quanta tanta kelka irgaquanta nulaquanta omnaquanta
Quantity -


quanto quanto tanto kelko irga quanto 4 nula quanto 4 la tota quanto 4
  1. The initial i can be omitted: ta, to, ti, ta.
  2. One can omit the initial a: ultempe, nultempe, ulspeca, nulspeca, ulmaniere, nulmaniere.
  3. omnatempe is correct and usable, but sempre is the actual word.
  4. Instead of irga quanto, nula quanto and la tota quanto one usually says irgo, nulo and omno.

Compound formation

Composition in Ido obeys stricter rules than in Esperanto, especially formation of nouns, adjectives and verbs from a radical of a different class. The reversibility principle assumes that for each composition rule (affix addition), the corresponding decomposition rule (affix removal) is valid.

Hence, while in Esperanto an adjective (for instance papera, formed on the noun radical paper(o), can mean an attribute (papera enciklopedio “paper-made encyclopedia”) and a relation (papera fabriko “paper-making factory”), Ido will distinguish the attribute papera (“paper” or “of paper” (not “paper-made” exactly)) from the relation paperala (“paper-making”).

Similarly, krono means in both Esperanto and Ido the noun “crown”; where Esperanto allows formation of “to crown” by simply changing the ending from noun to verb kroni (“crowning” is kronado), Ido requires an affix so the composition is reversible: kronizar (“the act of crowning” is kronizo).

According to Claude Piron, some modifications brought by Ido are in practice impossible to use and ruin spontaneous expression:

Ido displays, on linguistic level, other drawbacks Esperanto succeeded to avoid, but I don’t have at hand documents which would allow me to go further in detail. For instance, if I remember correctly, where Esperanto only has the suffix -igi*, Ido has several: *-ifar*, *-izar*, *-igar*, which match subtleties which were meant to make language clearer, but that, in practice, inhibit natural expression.[32]


Vocabulary in Ido is derived from French, Italian, Spanish, English, German, and Russian. Basing the vocabulary on various widespread languages was intended to make Ido as easy as possible for the greatest number of people possible. Early on, the first 5,371 Ido word roots were analyzed compared to the vocabulary of the six source languages, and the following result was found:[33]

  • 2024 roots (38%) belong to 6 languages
  • 942 roots (17%) belong to 5 languages
  • 1111 roots (21%) belong to 4 languages
  • 585 roots (11%) belong to 3 languages
  • 454 roots (8%) belong to 2 languages
  • 255 roots (5%) belong to 1 language

Another analysis showed that:

  • 4880 roots (91%) are found in French
  • 4454 roots (83%) are found in Italian
  • 4237 roots (79%) are found in Spanish
  • 4219 roots (79%) are found in English
  • 3302 roots (61%) are found in German
  • 2821 roots (52%) are found in Russian
Comparison of Ido vocabulary with its six source languages
Ido English Italian French German Russian Spanish
bona good ("bonus") buono bon gut ("Bonus") khoroshiy (хороший) bueno
donar give ("donate") dare ("donare") donner geben dat (дать), darit (дарить) dar, donar
filtrar filter filtrare filtrer filtern filtrovat (фильтровать) filtrar
gardeno garden giardino jardin Garten sad (caд) jardín
kavalo horse ("cavalry") cavallo cheval Pferd ("Kavallerie") loshad, kobyla (лошадь, кобыла) caballo
maro sea ("marine") mare mer Meer more (море) mar
naciono nation nazione nation Nation natsija (нация) nación
studiar study studiare étudier studieren izuchat, (изучать) estudiar
yuna young ("juvenile") giovane jeune jung yunyi, molodoy (юный, молодой) joven

Vocabulary in Ido is often created through a number of official prefixes and suffixes that alter the meaning of the word. This allows a user to take existing words and modify them to create neologisms when necessary, and allows for a wide range of expression without the need to learn new vocabulary each time. Though their number is too large to be included in one article, some examples include:

  • The diminutive suffix -et-. Domo (house) becomes dometo (cottage), and libro (book) becomes libreto (novelette or short story).
  • The pejorative suffix -ach-. Domo becomes domacho (hovel), and libro becomes libracho (a shoddy piece of work, pulp fiction, etc.)
  • The prefix retro-, which implies a reversal. Irar (to go) becomes retroirar (to go back, backward) and venar (to come) becomes retrovenar (to return).

New vocabulary is generally created through an analysis of the word, its etymology, and reference to the six source languages. If a word can be created through vocabulary already existing in the language then it will usually be adopted without need for a new radical (such as wikipedio for Wikipedia, which consists of wiki + enciklopedio for encyclopedia), and if not an entirely new word will be created. The word alternatoro for example was adopted in 1926, likely because five of the six source languages used largely the same orthography for the word, and because it was long enough to avoid being mistaken for other words in the existing vocabulary.[34] Adoption of a word is done through consensus, after which the word will be made official by the union. Care must also be taken to avoid homonyms if possible, and usually a new word undergoes some discussion before being adopted. Foreign words that have a restricted sense and are not likely to be used in everyday life (such as the word intifada to refer to the conflict between Israel and Palestine) are left untouched, and often written in italics.

Ido, unlike Esperanto, does not assume the male sex by default. For example, Ido does not derive the word for “waitress” by adding a feminine suffix to “waiter”, as Esperanto does. Instead, Ido words are defined as sex-neutral, and two different suffixes derive masculine and feminine words from the root: servisto for a waiter of either sex, servistulo for a male waiter, and servistino for a waitress. There are only two exceptions to this rule:[14] First, patro for “father”, matro for “mother”, and genitoro for “parent”, and second, viro for “man”, muliero for “woman”, and adulto for “adult”.[35]


The Lord's Prayer:


Patro nia, qua esas en la cielo,
tua nomo santigesez;
tua regno advenez;
tua volo facesez
quale en la cielo, tale anke sur la tero.
Donez a ni cadie l'omnadiala pano,
e pardonez a ni nia ofensi,
quale anke ni pardonas a nia ofensanti,
e ne duktez ni aden la tento,
ma liberigez ni del malajo.


Our Father, who is in heaven,
hallowed be your name.
Your kingdom come,
your will be done,
on earth as it is in heaven.
Give us this day our daily bread,
and forgive us our debts,
as we also have forgiven our debtors.
And lead us not into temptation,
but deliver us from evil.

Literature and publications

Ido has a number of publications that can be subscribed to or downloaded for free in most cases. Kuriero Internaciona is a magazine produced in France every few months with a range of topics. Adavane! is a magazine produced by the Spanish Ido Society every two months that has a range of topics, as well as a few dozen pages of work translated from other languages. Progreso is the official organ of the Ido movement and has been around since the inception of the movement in 1908. Other sites can be found with various stories, fables or proverbs along with a few books of the Bible translated into Ido on a smaller scale. The site publikaji has a few podcasts in Ido along with various songs and other recorded material.

Wikipedia includes an Ido-language edition (known in Ido as Wikipedio); in January 2012 it was the 81st most visited Wikipedia.[36]

International Ido conventions

ULI organises Ido conventions yearly, and the conventions include a mix of tourism and work.[37]

See also


  1. ^ a b Blanke (2000), cited in Sabine Fiedler "Phraseology in planned languages", Phraseology / Phraseologie, Walter de Gruyter 2007. pp. 779.
  2. ^ "Esperanto-English Dictionary". Retrieved 12 February 2012.
  3. ^ "Libreyo" (in Ido). 27 January 2018. Retrieved 27 December 2018.
  4. ^ Antoine de Saint-Exupéry (2013). La Princeto (in Ido). Translated by Fernando Tejón. Retrieved 27 December 2018.
  5. ^ "Evangelio da Santa Lukas" (PDF) (in Ido). Translated by L. Kauling. 1926. Retrieved 27 December 2018.
  6. ^ a b Guérard, A. L. "Chapter VII". A Short History of the International Language Movement. Retrieved 12 February 2012.
  7. ^ a b c d Dyer, Luther H (1923). The Problem of an International Auxiliary Language and its Solution in Ido. pp. 54–74. Retrieved 12 February 2012.
  8. ^ Leau, Léopold (August 1933). "La Vereso pri la Delegitaro en 1907" [The Truth about the Delegation in 1907]. Progreso. X (96): 4. Retrieved 12 February 2012.
  9. ^ Jacob, Henry (1947). "II. Ido". A Planned Auxiliary Language. Retrieved 12 February 2012.
  10. ^ Lapenna, Ivo; Ulrich Lins; Tazio Carlevaro (1974). Esperanto en perspektivo: Faktoj kaj analizoj pri la internacia lingvo (in Esperanto). London: Centro de Esploro kaj Dokumentado pri la Monda Lingvo-Problemo. p. 424.
  11. ^ Harlow, Donald J (4 July 2006). "Ido". How to Build a Language. Archived from the original on 4 February 2012. Retrieved 12 February 2012.
  12. ^ Harlow, Donald J (4 July 2006). "Novial". How to Build a Language. Archived from the original on 4 February 2012. Retrieved 12 February 2012.
  13. ^ MacLeod, Dave (23 November 2005). "Votez! Kande vu komencis lernar Ido?" [Vote! When did you start learning Ido?]. Retrieved 19 January 2012.
  14. ^ a b Chandler, James (6 November 1997). "Changes in Ido since 1922". Retrieved 19 January 2012.
  15. ^ "Listo di nova vorti propozita da la Linguala komitato dil Uniono" [List of new words proposed by the Language committee of the Union]. Suplemento a la revuo Progreso numero 290. ULI.
  16. ^ Bol, Jacques (2004-11-15). "Pri Camiel de Cock" [About Camiel de Cock].
  17. ^ Chandler, James (2006-04-16). "Lasta decido pri nova vorti".
  18. ^ Landais, Loïc (2008-02-17). "Nova DK di ULI por 2008–2011".
  19. ^ Neves, Gonçalo (2008-08-29). "demisiono ed adio" [resignation and farewell].
  20. ^ Landais, Loïc (2009-09-28). "Linguala Komitato di ULI" [Linguistic Committee of the ULI].
  21. ^ Richard, Gaël (2010-02-09). "RE: [linguo] Ube es komitato linguala" [RE: [language] Where is the language committee].
  22. ^ "Linguala Komitato di ULI" [Linguistic Committee of the ULI]. Uniono por la Linguo Internaciona Ido (ULI).
  23. ^ Jibran (Partaka ), Khalil (2010-04-16). "Ido havas nova Sekretario pri Linguala Questioni" [Ido has a new Secretary of Linguistic Issues].
  24. ^ "Nomino di Sekretario por Linguala Questioni di ULI" [Nomination of the Secretariat for Longish Functions]. Uniono por la Linguo Internaciona Ido. 2010-04-03.
  25. ^ Madonna, Tiberio (2011-01-01). "2esma raporto de la Linguala Komitato" [2nd report of the Linguistic Committee 3].
  26. ^ Chandler, James (2011-01-02). "RE: [linguo] 2esma raporto de la Linguala Komitato".
  27. ^ "La Direktanta Komitato di ULI". ULI.
  28. ^ De Beaufront, Louis (2004) [1st pub. 1925]. Tejón, Fernando, ed. "Pronunco dil vokali" (PDF). Kompleta Gramatiko detaloza di la linguo internaciona Ido (in Ido). Ponferrada, Spain: Krayono. p. 7. Archived (PDF) from the original on 13 August 2015.
  29. ^ De Beaufront, L (2004). "Acento tonika" [Tonic accent] (PDF). Kompleta Gramatiko Detaloza di Ido. pp. 11–12. Retrieved 19 January 2012.
  30. ^ a b De Beaufront, L (2004). "Kompleta Gramatiko Detaloza di Ido" [Comeplete Detailed Grammar of Ido] (PDF). pp. 7–10. Retrieved 19 January 2012.
  31. ^ Eventoj, no. 103, ISSN 1215-959X. Ci estas senvalora balasto (Ci is useless ballast). 1996. Available at
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  33. ^ Dyer, Luther H (1923). The Problem of an International Auxiliary Language and its Solution in Ido. pp. 101–121. Retrieved 19 January 2012.
  34. ^ De Cock, Camiel (1988). "Lexiko di nova vorti" [Lexicon of new words]. Retrieved 19 January 2012.
  35. ^ ApGawain, Niklas; Hugon, P. D.; Moore, J. L.; De Beaufront, Louis (2008) [1st pub. 1999]. Muelver, Jerry, ed. Ido for All (PDF) (1.6 ed.). North American Ido Society. pp. 42, &nbsp, 52, &nbsp, 70. Archived from the original (PDF) on 25 November 2011.
  36. ^ Zachte, Erik (18 January 2012). "Page Views for Wikipedia, Non-mobile, Normalized". Retrieved 19 January 2012.
  37. ^ "ULI's website". Retrieved 10 January 2016.

Additional notes

  1. L. Couturat, L. Leau. Delegation pour l'adoption d'une Langue auxiliare internationale (15–24 October 1907). Coulommiers: Imprimerie Paul Brodard, 1907

Reference to french article

External links

General information

History and opinions

Places to learn Ido and pages in the language


Adjuvilo is a language created in 1910 by Claudius Colas under the pseudonym of "Profesoro V. Esperema". Although it was a full language, it may not have been created to be spoken. Many believe that as an Esperantist, Colas created Adjuvilo to help create dissent in the then-growing Ido movement. Colas himself called his language simplified Ido and proposed several reforms to Ido.

Colas created a nearly complete grammar, but did not create a new vocabulary. Adjuvilo uses mainly the vocabulary of Ido with modifications according to the grammatical changes of Ido. Colas in some cases reestablishes the Esperanto forms of words and even constructed some new words like sulo for "sun" (Ido/Esperanto: suno) and dago for "day" (Ido: dio, Esperanto: tago).

Comparison between Esperanto and Ido

Ido, like Esperanto, is a constructed international auxiliary language.

L. L. Zamenhof published his constructed language under the pseudonym Dr Esperanto in 1887. It immediately became popular, but soon people were making suggestions as to how they thought it might be improved. Zamenhof responded by making a list of possible changes to Esperanto and in 1894 put them before the Esperanto community. If accepted they would create what Dr Zamenhof called "a Reformed Esperanto". This proposed reformed Esperanto is sometimes referred to as Esperanto 1894. However, when the Esperanto community was invited to vote on whether to adopt the proposals, they rejected the proposals by a large majority.

Ido was created around a quarter of a century after Esperanto. The name Ido means "offspring" in Esperanto and was so named by its creators because it was a development of Esperanto. The creation of Ido led to a schism between those who believed that Esperanto should be left as it was and those who believed that it had what they perceived as inherent flaws which made it not quite good enough to be the world's international auxiliary language. Those who opposed change maintained that it was endless tinkering that had led, in their opinion, to the decline of Volapük a once popular constructed language that had predated Esperanto's publication by a few years. They would also surely have pointed out that Dr Zamenhof's reform proposals of 1894 had been rejected by popular vote.

The languages of Esperanto and Ido remain close, and largely mutually intelligible, like two dialects of the same language. Just as dialects of a language are quite often sources of new words for that language through literature, so Ido has contributed many neologisms to Esperanto (especially in poetic substitutes for long words using the mal- prefix).

One study conducted with 20 college students at Columbia University circa 1933 suggests that Esperanto's system of correlative words is easier to learn than Ido's. Two other studies by the same researchers suggest no significant overall difference in difficulty of learning between Esperanto and Ido for educated American adults, but the sample sizes were again small: in the two tests combined, only 32 test subjects studied Ido. The researchers concluded that additional comparative studies of Esperanto and Ido are needed.

Comparison between Ido and Interlingua

Ido and Interlingua are two constructed languages created in the 20th century. Both have had some measure of success, but Interlingua has enjoyed greater diffusion and acceptance by public and private institutions—it is taught in many high schools and universities, for example. Ido is what is called schematic (easier to learn for speakers of very different languages), whereas Interlingua is what is called naturalistic (easier to understand for speakers of related languages).

Comparison between Ido and Novial

Novial was created by Otto Jespersen, who had also been a co-author of Ido. Both languages base their vocabularies primarily on the Germanic and Romance languages but differ grammatically in several important respects. Comparisons among Ido, Novial, and other notable international auxiliary languages have formed an important part of interlinguistic studies. For example, both Ido and Novial were among the languages investigated by the International Auxiliary Language Association (IALA), which developed Interlingua. This article is intended to provide an overview of the salient differences and similarities of Ido and Novial.

Novial is more analytic than Ido, and in Jespersen's view more natural.

Delegation for the Adoption of an International Auxiliary Language

The Delegation for the Adoption of an International Auxiliary Language (French: Délégation pour l'Adoption d'une Langue Auxiliaire Internationale) was a body of academics convened in the early part of the 1900s (decade) to decide on the issue of which international auxiliary language should be chosen for international use. The ultimate decision of the committee charged by the Delegation was to adopt the Esperanto language, but with certain reforms. The result became a distinct language known as Ido.

English false friends in Ido

This is a list of English false friends in the constructed language Ido.


An Esperantido is a constructed language derived from Esperanto. Esperantido originally referred to the language which is now known as Ido. The word Esperantido is derived from Esperanto plus the affix -id- (-ido), which means a "child (born to a parent), young (of an animal) or offspring" (ido). Hence, Esperantido literally means an "offspring or descendant of Esperanto".

A number of Esperantidos have been created to address a number of perceived flaws or weaknesses in Esperanto, or in other Esperantidos, attempting to improve their lexicon, grammar, pronunciation, and orthography. Others were created as language games or to add variety to Esperanto literature.


Esperanto () is the most widely spoken constructed international auxiliary language. It was created in the late 19th century by L. L. Zamenhof, a Polish-Jewish ophthalmologist. In 1887, he published a book detailing the language, Unua Libro ("First Book"), under the pseudonym Dr. Esperanto. Esperanto translates to English as "one who hopes".Zamenhof's goal was to create an easy and flexible language that would serve as a universal second language to foster peace and international understanding, and to build a community of speakers, as he correctly inferred that one can’t have a language without a community of speakers.His original title for the language was simply the international language (lingvo internacia), but early speakers grew fond of the name Esperanto and began to use it as the name for the language in 1889; the name quickly gained prominence and has been used as an official name ever since.In 1905, Zamenhof published Fundamento de Esperanto as a definitive guide to the language. Later that year, he organized the first World Esperanto Congress, an ongoing annual conference, in Boulogne-sur-Mer, France. The first congress ratified the Declaration of Boulogne, which established several foundational premises for the Esperanto movement. One of its pronouncements is that Fundamento de Esperanto is the only obligatory authority over the language. Another is that the Esperanto movement is exclusively a linguistic movement and that no further meaning can ever be ascribed to it. Zamenhof also proposed to the first congress that an independent body of linguistic scholars should steward the future evolution of Esperanto, foreshadowing the founding of the Akademio de Esperanto, in part modeled after the Académie française, which was established soon thereafter. Since 1905, congresses have been held in various countries every year, with the exceptions of years during the World Wars. In 1908, a group of young Esperanto speakers led by Hector Hodler established the Universal Esperanto Association, in order to provide a central organization for the global Esperanto community.

Esperanto grew throughout the 20th century, both as a language and as a linguistic community. Despite speakers facing persecution in regimes such as Nazi Germany and the Soviet Union under Stalin, Esperanto speakers continued to establish organizations and publish periodicals tailored to specific regions and interests. In 1954, the United Nations granted official support to Esperanto as an international auxiliary language in the Montevideo Resolution. Several writers have contributed to the growing body of Esperanto literature, including William Auld, who received the first nomination for the Nobel Prize in Literature for a literary work in Esperanto in 1999, followed by two more in 2004 and 2006. Esperanto-language writers are also officially represented in PEN International, the worldwide writers association, through Esperanto PEN Centro.Esperanto has continued to develop in the 21st century. The advent of the Internet has had a significant impact on the language, as learning it has become increasingly accessible on platforms such as Duolingo and as speakers have increasingly networked on platforms such as Amikumu. With approximately two million speakers, a small portion of whom are native speakers, it is the most widely spoken constructed language in the world. Although no country has adopted Esperanto officially, Esperantujo is the collective name given to places where it is spoken, and the language is widely employed in world travel, correspondence, cultural exchange, conventions, literature, language instruction, television and radio broadcasting.

While its advocates continue to hope for the day that Esperanto becomes officially recognized as the international auxiliary language, an increasing number have stopped focusing on this goal and instead view the Esperanto community as a "stateless diasporic linguistic minority" based on freedom of association, with a culture worthy of preservation based on its own merit. Some have also chosen to learn Esperanto due to its purported help in third language acquisition.

Hjalmar Magnus Eklund

Hjalmar Magnus Eklund (12 January 1880 in Turku – 10 June 1937 in Pargas) was the first Finnish expert in mathematical logic and philosophy and also a pioneer in the Ido language.


Io, IO, iO, I/O, i/o, or i.o. may refer to:

Io (mythology), daughter of Inachus in Greek mythology, and lover of Zeus who was turned into a cow

Io (moon), a moon of Jupiter

List of language names

This article is a resource of how to say the native name of most of the major languages in the world. These are endonymic glossonyms.

Louis Couturat

Louis Couturat (French: [kutyʁa]; 17 January 1868 – 3 August 1914) was a French logician, mathematician, philosopher, and linguist.

Louis de Beaufront

Louis Chevreux (3 October 1855, Paris – 8 January 1935, Thézy-Glimont), commonly known as Louis de Beaufront, was a major influence in the development of Ido, an international auxiliary language. Beaufront was initially an advocate of Esperanto and was largely responsible for its early diffusion in western Europe as well as one of its first French proponents.

Otto Jespersen

Jens Otto Harry Jespersen (Danish: [ʌto ˈjɛsbɐsn̩]; 16 July 1860 – 30 April 1943) was a Danish linguist who specialized in the grammar of the English language.

Swedish Ido Association

Swedish Ido Association was founded in Stockholm 21 April 1911 and was associated with Uniono por la linguo internaciona - ULI. The purpose was to promote the usage of the universal Ido language in Sweden.

During the 1930s the Swedish Ido Association was one of the largest associations in Sweden that advocated the usage of a universal language. The association had about 200 exercising and 100 supporting members. The association published periodicals and literature in Ido. Among other periodicals Komuniki (1964–1988) Svensk Världsspråkstidning 1925-59 and Mondo 1912-34 can be mentioned.

Due to receding numbers of members, an extra general meeting decided to dissolve the association in Stockholm 2 August 1996. At this meeting the Ido-foundation for Language Research in Memory of Hellmut Röhnisch was created using the assets of the association. Hellmut Röhnisch was the last chairman of the Swedish Ido Association.

Union for the International Language Ido

Union for the International Language Ido (Ido: Uniono por la Linguo Internaciona Ido, ULI) is the official union of the Ido-language movement. Based in Amsterdam, Netherlands, its main functions are the propagation of the language, arranging the yearly conferences in which Ido speakers gather, and the publishing of the magazine Progreso (Progress), begun in 1908 by Louis Couturat, one of the founders of the movement who died in 1914. Currently there are representatives from 23 countries as official members of the union.

The ULI is to Ido as the Universal Esperanto Association is to Esperanto.

The 2008 conference was held in Wuppertal, Germany, from 22 to 26 August.

Wilhelm Ostwald

Friedrich Wilhelm Ostwald (2 September 1853 – 4 April 1932) was a German chemist. He received the Nobel Prize in Chemistry in 1909 for his work on catalysis, chemical equilibria and reaction velocities. Ostwald, Jacobus Henricus van 't Hoff, Walther Nernst, and Svante Arrhenius are usually credited with being the modern founders of the field of physical chemistry.

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