Vigilance definition : state or quality of being vigilant ; watchfulness.. See examples of VIGILANCE used in a sentence. 2 meanings: 1. the fact, quality, or condition of being vigilant 2. the abnormal state or condition of being unable to sleep.... Click for more definitions. Vigilance definition : The quality or state of being vigilant ; watchfulness. Definition of vigilance noun in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
