/ Dictionary / Index I Isa.: Meaning and Definition of Find definitions for: Isa. Pronunciation: [key] Isaiah. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. is Isaac Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language