adj.

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.

n.

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.

tr.v., 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.

idiom:

on the alert

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

[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) + erta, lookout (from past participle of ergere, to raise, from Latin ērigere; see erect).]

alertly a·lert'ly adv.
alertness a·lert'ness n.

(1) A sound or visual signal that indicates that some predefined event has occurred or some error condition has occurred. The terms alert and alarm are often used synonymously. See alarm.

(2) A document with urgent information about a threat or vulnerability such as CIAC Bulletins at http://ciac.llnl.gov/ciac/CIACHome.html.

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adjective

1. Vigilantly attentive: observant, open-eyed, vigilant, wakeful, wary, watchful, wide-awake. Idioms: on the ball. See awareness/unawareness.
2. Mentally quick and original: bright, clever, intelligent, keen, quick, quick-witted, sharp, sharp-witted, smart. Idioms: smart as a whip. See ability/inability.

noun

A signal that warns of imminent danger: alarm, alarum, tocsin, warning. See warn/invite.

verb

To notify (someone) of imminent danger or risk: admonish, alarm, caution, forewarn, warn. See warn/invite.

adj

Definition: attentive, lively
Antonyms: asleep, drowsy, inattentive, lethargic, sluggish, unobservant, weary

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is short for:

Meaning	Category
Accelerated Licensure Evaluation And Review Techniques	Governmental->US Government
Actual Learning Environment Response Training	Community->Educational
Advanced Local Emergency Response Team	Medical
Air Land Emergency Rescue Team	Governmental->Military
Area Law Enforcement and Retailers Team	Governmental->Police
Assisted Learning Environment Response Team	Community->Educational
Attack Launch Early Reporting to Theater	Governmental->Military
Augmented Learning Environment For Renewable Teaching	Community->Educational

Click here to submit an acronym.

(DOD, NATO) 1. Readiness for action, defense or protection. 2. A warning signal of a real or threatened danger, such as an air attack. 3. The period of time during which troops stand by in response to an alarm. 4. To forewarn; to prepare for action. See also airborne alert. 5. (DOD only) A warning received by a unit or a headquarters which forewarns of an impending operational mission. 6. (DOD only) In aviation, an aircraft and aircrew that are placed in an increased state of readiness so that they may be airborne in a specified period of time after a launch order is received. See also air defense warning conditions; ground alert; warning order.

IN BRIEF: Ready; watchful. Quick-thinking.

Chocolate flows in deep dark, sweet waves, a river to ignite my mind and alert my senses. — Quoted from www.zaadz.com

Dansk (Danish)
adj. - årvågen, vagtsom
n. - alarm, beredskab, alarmberedskab
v. tr. - alarmere, sætte i alarmberedskab

idioms:

• on the alert (for)    være på vagt for

Nederlands (Dutch)
alert, levendig, waarschuwen, waarschuwing

Français (French)
adj. - alerte, prompt à la riposte, vigilant, vif, éveillé
n. - alerte, (Mil) en état d'alerte, sur le qui-vive
v. tr. - alerter, (fig) éveiller l'attention de

idioms:

• on the alert    (être) sur le qui-vive, (Mil) (être) en état d'alerte

Deutsch (German)
adj. - wachsam, gewitzt, aufmerksam, flink
n. - Aufmerksamkeit, Wachsamkeit, (Milit.) Alarmbereitschaft, Alarmsignal
v. - warnen, alarmieren

idioms:

• on the alert    auf der Hut sein

Ελληνική (Greek)
v. - ξεσηκώνω, θέτω σε επιφυλακή
adj. - άγρυπνος, επαγρυπνών, ανοιχτομάτης, ξύπνιος, ζωηρός, σβέλτος

idioms:

• on the alert (for)    σε επιφυλακή

Italiano (Italian)
allarme, pronto, vigile, svelto

idioms:

• be on the alert    stare all'erta
• be on the alert for    tenersi in guardia per

Português (Portuguese)
v. - alertar, alarmar, prevenir
adj. - vigilante, ativo, alerta, atento

idioms:

• be on the alert    estar de prontidão
• be on the alert for    estar de prontidão, precaver-se
• on the alert (for)    de sobreaviso (para)
• red alert    alerta vermelho

Русский (Russian)
бдительность, сметливый, бдительный, внимательный, скорый

idioms:

• be on the alert    быть начеку
• be on the alert for    опасаться чего-то
• on the alert (for)    наготове
• red alert    последняя стадия боевой готовности при угрозе атаки

Español (Spanish)
adj. - alerta, despierto, despabilado, vigilante, activo, atento
n. - alerta, alarma, vigilante
v. tr. - alertar, alarmar, despertar, despabilar, vigilar, activar

idioms:

• on the alert    estar alerta, estar ojo alerta, sobre aviso

Svenska (Swedish)
v. - larma
adj. - vaken, pigg, uppmärksam

中文（简体） (Chinese (Simplified))
灵敏的, 警觉的, 留心的, 警报, 警戒, 警戒期间, 警戒状态, 向...报警, 使注意, 使警觉, 通知待命

idioms:

• on the alert (for)    警惕着

中文（繁體） (Chinese (Traditional))
adj. - 靈敏的, 警覺的, 留心的
n. - 警報, 警戒, 警戒期間, 警戒狀態
v. tr. - 向...報警, 使注意, 使警覺, 通知待命

idioms:

• on the alert (for)    警惕著

한국어 (Korean)
adj. - 빈틈없는, 기민한
n. - 공습 경보, 경보 발령 기간
v. tr. - 경고하다

日本語 (Japanese)
adj. - 油断のない, 機敏な
n. - 警戒警報, 警戒警報発令期間
v. - 警報を出す, 警戒態勢をとらせる

idioms:

• be on the alert    油断なく警戒して
• be on the alert for    油断なく見張って
• on the alert (for)    警戒して

العربيه (Arabic)
‏(فعل) ينبه أو يحذر (صفه) يقظ, رشيق‏

עברית (Hebrew)
adj. - ‮דרוך, עירני, זריז, מהיר, הזהיר, העמיד על המשמר‬
n. - ‮אתראה, אזעקה, כוננות‬
v. tr. - ‮הזהיר, העמיד על המשמר‬

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Medical Alert	amber alert
red alert	coding alert