/ Dictionary / Index A app: Meaning and Definition of Find definitions for: app Pronunciation: (ap), [key] &hasp;). an application program; application software. app. Pronunciation: [key] apparatus. apparent. appendix. applied. appointed. approved. approximate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. apotropaism appal Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language