/ Dictionary / Index M memento: Meaning and Definition of Find definitions for: me•men•to Pronunciation: (mu-men'tō), [key] — pl. -tos, -toes. an object or item that serves to remind one of a person, past event, etc.; keepsake; souvenir. anything serving as a reminder or warning. (cap., italics)either of two prayers in the canon of the Mass, one for persons living and the other for persons dead. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: memento (Thesaurus) Memel memento mori Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language