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vigilance

[vij-uh-luh ns]
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noun
  1. state or quality of being vigilant; watchfulness: Vigilance is required in the event of treachery.
  2. Pathology. insomnia.
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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

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1. alertness, attention, heedfulness, concern, care.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for vigilance

vigilance

noun
  1. the fact, quality, or condition of being vigilant
  2. the abnormal state or condition of being unable to sleep
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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

n.

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

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Online Etymology Dictionary, © 2010 Douglas Harper