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Adjective: alert (alerter,alertest)  u'lurt
  1. Engaged in or accustomed to close observation
    "alert enough to spot the opportunity when it came"; "constantly alert and vigilant, like a sentinel on duty"; "caught by a couple of alert cops";
    - watchful
  2. Quick and energetic
    - brisk, lively, merry, rattling, snappy, spanking, zippy
  3. Mentally perceptive and responsive
    "an alert mind"; "alert to the problems";
    - alive, awake, on the ball
Verb: alert  u'lurt
  1. Warn or arouse to a sense of danger or call to a state of preparedness
    "We alerted the new neighbours to the high rate of burglaries";
    - alarm
Noun: alert  u'lurt
  1. Condition of heightened watchfulness or preparation for action
    "bombers were put on alert during the crisis";
    - qui vive
  2. A warning serves to make you more alert to danger
    - alerting
  3. An automatic signal (usually a sound) warning of danger
    - alarm, warning signal, alarum [archaic]

Derived forms: alertest, alerting, alerted, alerter, alerts

See also: argus-eyed, awake, aware, cognisant [Brit], cognizant, energetic, fly [Brit], heads-up, lidless, lively, open-eyed, sleepless, vigilant, wakeful, wary, watchful, wide-awake

Type of: preparation, preparedness, readiness, sign, signal, signaling [US], signalling, warn, warning

Antonym: unalert

Encyclopedia: Alert, Nunavut