/ Dictionary / Index C change key: Meaning and Definition of Find definitions for: change' key" Pronunciation: [key] a key opening only one lock. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. changeful changeless Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language