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vigilance

[vij-uh-luh ns] /ˈvɪdʒ ə ləns/
noun
1.
state or quality of being vigilant; watchfulness:
Vigilance is required in the event of treachery.
2.
Pathology, insomnia.
Origin of vigilance
1560-1570
1560-70; alteration (-ance for -ancy) of obsolete vigilancy < Latin vigilantia; see vigilant, -ancy
Related forms
hypervigilance, noun
nonvigilance, noun
previgilance, noun
supervigilance, noun
Synonyms
1. alertness, attention, heedfulness, concern, care.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for vigilance

vigilance

/ˈvɪdʒɪləns/
noun
1.
the fact, quality, or condition of being vigilant
2.
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
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Word Origin and History for vigilance
n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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15
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