/ Dictionary / Index I Idaho: Meaning and Definition of Find definitions for: I•da•ho Pronunciation: (ī'du-hō"), [key] — n. a state in the NW United States. 943,935; 83,557 sq. mi. (216,415 sq. km). Cap.: Boise. Abbr.: ID (for use with zip code), Id., Ida. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: idaho (Thesaurus) Idaean Idaho Falls Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language