Webster's English Dictionary

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alert

Cross references:
  1. intelligent            2. watchful              
 
1. alert \*-'l*rt\ aj [It all'erta, lit., on the ascent] 1a: watchful and 
   prompt to meet danger  1b: quick to perceive and act  2: ACTIVE, BRISK  - 
   alert.ly av
2. alert n 1: an alarm or other signal of danger  2: the period during 
   which an alert is in effect  : on the lookout for danger  - on the alert 
3. alert vt : to call to a state of readiness : WARN