alert

Etymology 1

From French alerte (“alert”), from the phrase à l’erte (“on the watch”), from Italian all'erta (“to the height”), from erta (“lookout, tower”).

adj

  1. Attentive; awake; on guard.
  2. (obsolete) brisk; nimble; moving with celerity.

noun

  1. An alarm.
  2. A notification of higher importance than an advisory.
  3. (military) A state of readiness for potential combat.
    an airborne alert; ground alert

Etymology 2

Formed within English by conversion, from alert (adj). Compare French alerter.

verb

  1. To give warning to.

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