/ Dictionary / Index C Cinco de Mayo: Meaning and Definition of Find definitions for: Cin•co de Ma•yo Pronunciation: (Sp. sēng'kô e mä'yô), [key] a Mexican holiday marking the victory of Mexican troops over French forces in Puebla, Mexico, on May 5, 1862. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Cincinnatus cincture Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language