[1] : The Collaborative International Dictionary of English v.0.48

alert \alert"\ .al~ert", a. f. alerte, earlier `a
   l'erte on the watch, fr. it. all' erta on the watch, prop.
   standing on a height, where one can look around; erta a
   declivity, steep, erto steep, p. p. of ergere, erigere, to
   erect, raise, l. erigere. see erect.
   1. watchful; vigilant; active in vigilance.
      1913 webster

   2. brisk; nimble; moving with celerity.
      1913 webster

            an alert young fellow.                --addison.
      1913 webster

   syn: active; agile; lively; quick; prompt.
        1913 webster
see also:
erect 

[2] : The Collaborative International Dictionary of English v.0.48

alert \alert"\, n. mil.
   an alarm from a real or threatened attack; a sudden attack;
   also, a bugle sound to give warning. "we have had an alert."
   --farrow.
   1913 webster

   on the alert, on the lookout or watch against attack or
      danger; ready to act.
      1913 webster
see also:
on the alert 

[3] : WordNet (r) 2.0

alert
     adj 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" ant: unalert
     2: mentally responsive; "an alert mind"
     3: not unconscious; especially having become conscious; "the
        patient is now awake and alert" syn: awakep
     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" syn: alivep,
         awakep
     n 1: condition of heightened watchfulness or preparation for
          action; "bombers were put on alert during the crisis"
          syn: qui vive
     2: a warning serves to make you more alert to danger syn: alerting
     3: an automatic signal usually a sound warning of danger
        syn: alarm, warning signal, alarum
     v : 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" syn: alarm
see also:
unalert awakep alivep qui vive alerting alarm 
warning signal alarum 

[4] : Moby Thesaurus II by Grady Ward, 1.0

179 moby thesaurus words for "alert":
   klaxon, mayday, sos, active, admonish, advertent, advise, agile,
   agog, air-raid alarm, alarm, alarm bell, alarm clock, alarm signal,
   alarum, alert for, alive, all clear, all ears, all eyes, animated,
   apt, arouse, assiduous, attentive, awake, aware, beacon,
   blinking light, brainy, breathe, bright, brilliant, burglar alarm,
   buzz, buzzer, cant, careful, caution, cautious, clear-sighted,
   clear-witted, clearheaded, clever, concentrated, confide,
   confide to, conscious, crostarie, cry havoc, cry wolf, decisive,
   diligent, earnest, entrust with information, equal to, expeditious,
   fiery cross, finical, finicking, finicky, fire alarm, fire bell,
   fire flag, five-minute gun, flashing light, fly storm warnings,
   fog bell, fog signal, foghorn, forewarn, frighten, frisky,
   full of life, gale warning, gay, give confidential information,
   give fair warning, give notice, give warning, heedful, hooter,
   horn, hue and cry, hurricane warning, immediate, instant,
   instantaneous, intense, intent, intentive, issue an ultimatum,
   keen, knowing, let in on, let next to, lighthouse, lively,
   loaded for, lookout, mention privately, mercurial, meticulous,
   mindful, nice, niggling, nimble, note of alarm, notify, observant,
   observing, occulting light, on guard, on the, on the alert,
   on the ball, on the job, on the lookout, open-eared, open-eyed,
   openmouthed, police whistle, prepared for, prompt, punctual,
   put hep, put next to, qui vive, quick, quick-witted, ready,
   ready for, regardful, sharp, signal, signal of distress, siren,
   sleepless, small-craft warning, smart, sound the alarm,
   sound the tocsin, speedy, spirited, sprightly, spry, startle,
   still alarm, storm cone, storm flag, storm warning, summary, swift,
   threaten, tip, tip off, tocsin, two-minute gun, unblinking,
   unnodding, unsleeping, unwinking, up, up for, up to,
   upside-down flag, utter a caveat, vigilant, vivacious, wakeful,
   warn, warn against, warning, wary, watchful, whisper, whistle,
   wide awake, wide-awake

[5] : The Free On-line Dictionary of Computing (27 SEP 03)

alert
     
         /'lrt/ an audible and/or visual message
        intended to inform a system's users or administrators about a
        change in the operating conditions of that system or about
        some kind of error condition.  in a graphical user
        interface, an alert would typically be displayed as a small
        window containing the message and a button to click to dismiss
        the window.
     
        1999-03-29
     
     
see also:
graphical user interface 

Alert >> A Words
Alert, definition of term: Alert
alert_pag1.html

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