/ Dictionary / Index M merci*: Meaning and Definition of Find definitions for: mer•ci Pronunciation: (mer-sē'), [key] — interj. French. thank you. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. merchant seaman Mercia Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language