Vigilant Definition
 vĭjə-lənt 
    adjective
  
 Staying watchful and alert to danger or trouble.
 Webster's New World 
Synonyms: 
  Origin of Vigilant
-  
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
 -  
From French vigilant or its source, Latin vigilans, present participle of vigilare (“stay awake"), from vigil (“awake").
From Wiktionary
 
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