Pronunciation : I"o
Part of Speech : n.;
Etymology : [L.; cf. Gr. "iw`.]
Definition : Defn: An exclamation of joy or triumph; -- often interjectional.
pl. Ios.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder