Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: , present participle of vigilare 'to stay awake, keep watch', from vigil; VIGIL

vigilant

 adjective
     
vig‧i‧lant
giving careful attention to what is happening, so that you will notice any danger or illegal activity:
Please remain vigilant at all times and report anything suspicious.
—vigilantly adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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