Vigilant Definition
vĭjə-lənt
adjective
Staying watchful and alert to danger or trouble.
Webster's New World
Synonyms:
Origin of Vigilant
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Middle English from Old French from Latin vigilāns vigilant- present participle of vigilāre to be watchful vigilante
From American Heritage Dictionary of the English Language, 5th Edition
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From French vigilant or its source, Latin vigilans, present participle of vigilare (“stay awake"), from vigil (“awake").
From Wiktionary
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