/ Dictionary / Index P pay-in: Meaning and Definition of Find definitions for: pay-in Pronunciation: (pā'in"), [key] — n. a deposit in an account. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pay grade payload Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language