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Synonyms
a·lert (ə-lûrt́)

[French alerte, from Italian all' erta, on the lookout, alla, to the, on the (from Latin ad illam, to that) (ad, to; see ad–) (illam feminine accusative sing. of ille, that, the; see al-1), + erta, lookout (from past participle of ergere, to raise) (from Latin ērigere; see erect).]

adjective 

  1. Vigilantly attentive; watchful: alert to danger; an alert bank guard. See synonyms at aware
  2. Mentally responsive and perceptive; quick.
  3. Brisk or lively in action: the bird's alert hopping from branch to branch.

noun 

  1. A signal that warns of attack or danger: Sirens sounded the alert for an air raid.
  2. A condition or period of heightened watchfulness or preparation for action: Nuclear-armed bombers were put on alert during the crisis.

transitive verb: a·lert·ed, a·lert·ing, a·lerts. 

To notify of approaching danger or action; warn: a flashing red light that alerted motorists to trouble ahead.

idioms

on the alert
Watchful and prepared for danger, emergency, or opportunity: bird watchers on the alert for a rare species.

derivatives

a·lert́ly
adverb
a·lert́ness
noun