/ Dictionary / Index M motto: Meaning and Definition of Find definitions for: mot•to Pronunciation: (mot'ō), [key] — pl. -toes, -tos. a maxim adopted as an expression of the guiding principle of a person, organization, city, etc. a sentence, phrase, or word expressing the spirit or purpose of a person, organization, city, etc., and often inscribed on a badge, banner, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: motto (Thesaurus) mottled enamel mottramite Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language