/ Dictionary / Index I Isaiah: Meaning and Definition of Find definitions for: I•sa•iah Pronunciation: (ī-zā'u or, esp. Brit., ī-zī'u), [key] — n. Also calleda Major Prophet of the 8th century b.c. a book of the Bible bearing his name. Abbr.: Isa. a male given name. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: isaiah (Thesaurus) Isai Isaian Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language