Definition of 'alert'

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Noun

1. condition of heightened watchfulness or preparation for action; "bombers were put on alert during the crisis"
      Synonyms: qui vive
2. a warning serves to make you more alert to danger
      Synonyms: alerting
3. an automatic signal (usually a sound) warning of danger
      Synonyms: alarm warning signal alarum

Verb

1. warn or arouse to a sense of danger or call to a state of preparedness; "The empty house alarmed him"; "We alerted the new neighbors to the high rate of burglaries"
      Synonyms: alarm

Adjective

1. very attentive or observant; "an alert and responsive baby is a joy"; "caught by a couple of alert cops"; "alert enough to spot the opportunity when it came"; "constantly alert and vigilant, like a sentinel on duty"
      Antonyms: unalert
2. mentally responsive; "an alert mind"
3. not unconscious; especially having become conscious; "the patient is now awake and alert"
      Synonyms: awake
4. (usually followed by `to') showing acute awareness; mentally perceptive; "alert to the problems"; "alive to what is going on"; "awake to the dangers of her situation"; "was now awake to the reality of his predicament"
      Synonyms: alive awake

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