Alert definition, Alert meaning | English dictionary

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alert

  

      adj   usually postpositive  
1    vigilantly attentive  
alert to the problems     
2    brisk, nimble, or lively  
      n  
3    an alarm or warning, esp. a siren warning of an air raid  
4    the period during which such a warning remains in effect  
5    on the alert  
a    on guard against danger, attack, etc.  
b    watchful; ready  
on the alert for any errors     
      vb   tr  
6    to warn or signal (troops, police, etc.) to prepare for action  
7    to warn of danger, an attack, etc.  
     (C17: from Italian all'erta on the watch, from erta lookout post, from ergere to build up, from Latin erigere; see erect)  
  alertly      adv  
  alertness      n  


air alert  
      n     (Military)  
1    the condition in which combat aircraft are airborne and ready for an operation  
2    a signal to prepare for this  
English Collins Dictionary - English Definition & Thesaurus  
Collins

alert

  
1   
      adj   active, agile, attentive, awake, bright-eyed and bushy-tailed     (informal)   brisk, careful, circumspect, heedful, keeping a weather eye on, lively, nimble, observant, on guard, on one's toes, on the ball     (informal)   on the lookout, on the watch, perceptive, quick, ready, spirited, sprightly, vigilant, wary, watchful, wide-awake  
2   
      n   alarm, signal, siren, warning  
3   
      vb   alarm, forewarn, inform, notify, signal, warn  
  
Antonyms     
,       adj   careless, heedless, inactive, languid, lethargic, listless, oblivious, slow, unaware, unconcerned, unwary  
      n   all clear  
      vb   lull  

English Collins Dictionary - English synonyms & Thesaurus  

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