/ Dictionary / Index V vigilant: Meaning and Definition of Find definitions for: vig•i•lant Pronunciation: (vij'u-lunt), [key] — adj. keenly watchful to detect danger; wary: a vigilant sentry. ever awake and alert; sleeplessly watchful. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: vigilant (Thesaurus) vigilance committee vigilante Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language