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The definition of alert

7 Definitions of: alert

    1. adjective, vigilantly attentive
    2. adjective, brisk, nimble, or lively
    3. noun, an alarm or warning, esp a siren warning of an air raid
    4. noun, the period during which such a warning remains in effect
    5. noun, on the alert a) on guard against danger, attack, etc b) watchful; ready
    6. verb, to warn or signal (troops, police, etc) to prepare for action
    7. verb, to warn of danger, an attack, etc
    8. Show me some examples of this word: alert
    9. Show me the etymology of the word: alert
Synonyms: perceptive, active, agile, warning, signal, alarm, siren, watchful, vigilance, wary And more...
Antonyms: all clear, lull, careless
 

From Collins

©HarperCollins 2008. Collins English Dictionary definition of alert