Source : Webster's Revised Unabridged Dictionary (1913)

Ido \I"do\ ([=e]"d[=o]), n.
   An artificial international language, selected by the
   ``Delegation for the Adoption of an Auxillary International
   Language'' (founded at Paris in 1901), made public in 1907,
   and subsequently greatly revised and extended by a permanent
   committee or ``Academy.'' It combines systematically the
   advantages of previous schemes with a thoroughly logical word
   formation, and has neither accented constants nor arbitrarily
   coined pronominal words. For each idea that root is selected
   which is already most international, on the principle of the
   ``greatest facility for the greatest number of people.'' The
   word ``Ido'' means in the language itself ``offspring.'' The
   official name is: ``Linguo Internaciona di la Delegitaro
   (Sistema Ido).'' -- {I"dism}, n. -- {I"dist}, n.

Source : WordNet®

Ido
     n : an artificial language that is a revision and simplification
         of Esperanto