/ Dictionary / Index A ACA: Meaning and Definition of Find definitions for: ACA Pronunciation: [key] American Camping Association. American Canoe Association. American Casting Association. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. AC ACAA Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language