state or quality of being vigilant; watchfulness: Vigilance is required in the event of treachery.
Pathology. insomnia.

Origin of vigilance

1560–70; alteration (-ance for -ancy) of obsolete vigilancy < Latin vigilantia; see vigilant, -ancy
Related formshy·per·vig·i·lance, nounnon·vig·i·lance, nounpre·vig·i·lance, nounsu·per·vig·i·lance, noun

Synonyms for vigilance Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for vigilance



the fact, quality, or condition of being vigilant
the abnormal state or condition of being unable to sleep
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for vigilance

1560s, from French vigilance, from Latin vigilantia "wakefulness," from vigilia (see vigil).

Online Etymology Dictionary, © 2010 Douglas Harper