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[ee-doh] /ˈi doʊ/
a revised and simplified form of Esperanto, introduced in 1907.
< Esperanto: literally, offspring, equivalent to id- (< Greek; see -ides) + -o noun ending
Related forms
Idoism, noun
Idoist, noun
Idoistic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for Ido


an artificial language; a modification of Esperanto
Word Origin
C20: offspring, from Greek -id daughter of
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for Ido

1908, artificial language based on Esperanto, devised 1907; from Ido -ido "offspring," suffix representing Latin -ida, Greek -ides.

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for Ido

artificial language constructed by the French logician and Esperantist Louis de Beaufront and presented at the Delegation pour l'Adoption d'une Langue Auxiliaire Internationale (Delegation for the Adoption of an International Auxiliary Language) of 1907. The language is a reworking of Esperanto (q.v.), intended by its originator to improve upon what he considered weak points in Esperanto. In fact, Ido takes its name from an Esperanto suffix meaning "derived from"-i.e., derived from Esperanto. Ido allows spellings that are more natural to the average European than spellings in Esperanto, although they are less true to Esperanto's rule of one letter for each sound. It has excluded special accented letters found in Esperanto (c, j, s, g, h) in favour of more familiar forms (ch, j, sh; sounds equivalent to Esperanto g [English j] and h [Greek ch, Russian kh] are not represented), and it allows qu for Esperanto kw, x for ks, and y for Esperanto j. Its grammar is also similar to Esperanto, but Ido incorporates rather more Romance features-e.g., infinitives in -ar, -er, -ir as in Spanish, plurals of nouns in -i as in Italian, and verb inflections reminiscent of Latin or Interlingua. In the decade or two following its appearance, Ido acquired some popularity, which then declined.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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