/ Dictionary / Index V vigilance: Meaning and Definition of Find definitions for: vig•i•lance Pronunciation: (vij'u-luns), [key] — n. state or quality of being vigilant; watchfulness: Vigilance is required in the event of treachery. insomnia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: vigilance (Thesaurus) vigil vigilance committee Related Content Daily Word Quiz: acme Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language