alert definition

  • adjective:
    • Vigilantly mindful; watchful: alert to danger; an alert bank shield. See Synonyms at conscious.
    • psychologically receptive and perceptive; fast.
    • quick or vibrant doing his thing: the bird's alert hopping from branch to branch.
    • conscious; awake; on-guard.
    • Watchful; vigilant; energetic in vigilance.
    • Brisk; nimble; going with celerity.
    • engaged in or familiar with shut observation
    • psychologically perceptive and responsive
    • fast and lively
  • noun:
    • an indication that warns of attack or risk: Sirens seemed the alert for an air raid.
    • an ailment or period of increased watchfulness or preparation to use it: Nuclear-armed bombers were wear alert during crisis.
    • An alarm.
    • A notification of higher significance than an advisory.
    • An alarm from a genuine or threatened attack; a rapid assault; also, a bugle sound to give warning.
    • An attitude of vigilance; watch; guard: especially in the phrase on or upon the alert, upon the watch; on the lookout; guarding against surprise or danger: as, “the readiness of one on the alert,” Dickens.
    • a warning serves to cause you to more alert to risk
    • problem of heightened watchfulness or preparation to use it
    • an automatic signal (usually a sound) warning of danger
  • verb-transitive:
    • To notify of nearing danger or activity; warn: a flashing red-light that alerted motorists to trouble forward.
  • idiom:
    • on the alert Watchful and prepared for risk, crisis, or possibility: bird watchers in the alert for an unusual species.
  • verb:
    • to provide warning to.
    • warn or arouse to a feeling of risk or phone to circumstances of readiness
  • others:
    • Active in vigilance; watchful; vigilantly attentive.
    • Moving with celerity; brisk; active; nimble: as, “an alert young fellow,” Addison, Spectator, No. 403.
    • Lively, nimble, fast, prompt, prepared, spry.

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