/ Dictionary / Index M momentary: Meaning and Definition of Find definitions for: mo•men•tar•y Pronunciation: (mō'mun-ter"ē), [key] — adj. lasting but a moment; very brief; fleeting: a momentary glimpse. that might occur at any moment; ever impending: to live in fear of momentary annihilation. effective or recurring at every moment; constant. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: momentary (Thesaurus) momentarily momently Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language