/ Dictionary / Index A agcy.: Meaning and Definition of Find definitions for: agcy. Pronunciation: [key] agency. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. AGC age 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