/ Dictionary / Index K key plate: Meaning and Definition of Find definitions for: key' plate" Pronunciation: [key] — Print. Print. (in color printing) the plate providing the greatest definition of detail, usually the black plate, on which the other plates are registered. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. keypad keypunch Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language