/ Dictionary / Index P plate proof: Meaning and Definition of Find definitions for: plate' proof" Pronunciation: [key] — Print. Print. proof taken from a plate ready for printing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. platen plater Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language