/ Dictionary / Index C costume jewelry: Meaning and Definition of Find definitions for: cos'tume jew"elry Pronunciation: [key] jewelry made of nonprecious metals, sometimes gold-plated or silver-plated, often set with imitation or semiprecious stones. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. costume costumer Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language