Webster's English Dictionary

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vigilant

Cross references:
  1. watchful              
 
vig.i.lant \'vij-*-l*nt\ aj [ME, fr. MF, fr. L vigilant-, vigilans, fr. 
   prp. of vigilare]to keep watch, stay awake, fr. vigil awake : alertly 
   watchful esp. to avoid danger  - vig.i.lant.ly av