[vij-uh-luh nt] /ˈvɪdʒ ə lənt/

keenly watchful to detect danger; wary:
a vigilant sentry.
ever awake and alert; sleeplessly watchful.
keenly alert to or heedful of trouble or danger, as while others are sleeping or unsuspicious

late 15c., from Latin vigilantia “wakefulness,” from vigilia (see vigil). Related: Vigilantly.


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