alert

Alert! Alert! Alert! Did I get your attention? When you are alert, you are awake and ready. When you issue an alert you give warning, alerting people to, or notifying them of, a concern.

Alert is one of the rare words that can be used in the same form as a noun, verb, and adjective. In all parts of speech, alert implies preparedness. The word is derived from the French a l'erte which translates to "on the watch." When you hear the word, imagine an alarm going off. The alarm is the alert. When you hear it, you have been alerted and you are now alert.

Definitions of alert
  1. verb
    warn or arouse to a sense of danger or call to a state of preparedness
    “We alerted the new neighbors to the high rate of burglaries”
    synonyms: alarm
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    types:
    wake
    make aware of
    type of:
    warn
    notify of danger, potential harm, or risk
  2. noun
    condition of heightened watchfulness or preparation for action
    “bombers were put on alert during the crisis”
    synonyms: qui vive
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    types:
    air alert
    the condition in which combat aircraft are airborne and ready for an operation
    red alert
    the highest level of alert when an attack by the enemy seems imminent (or more generally a state of alert resulting from imminent danger)
    strip alert
    a state of readiness for domestic defense aircraft
    type of:
    preparation, preparedness, readiness
    the state of having been made ready or prepared for use or action (especially military action)
  3. noun
    an automatic signal (usually a sound) warning of danger
    synonyms: alarm, alarum, warning signal
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    types:
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    torpedo
    a small explosive device that is placed on a railroad track and fires when a train runs over it; the sound of the explosion warns the engineer of danger ahead
    air alert
    the warning signal that begins a period of preparation for an enemy air attack
    burglar alarm
    a loud warning signal produced by a burglar alarm
    fire alarm
    a shout or bell to warn that fire has broken out
    foghorn, fogsignal
    a loud low warning signal that can be heard by fogbound ships
    horn
    a noise made by the driver of an automobile to give warning;
    red flag
    a flag that serves as a warning signal
    siren
    a warning signal that is a loud wailing sound
    alarm bell, tocsin
    the sound of an alarm (usually a bell)
    type of:
    sign, signal, signaling
    any nonverbal action or gesture that encodes a message
  4. noun
    a warning that serves to make you more alert to danger
    synonyms: alerting
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    examples:
    Emergency Alert System
    a federal warning system that is activated by FEMA; enables the President to take over the United States airwaves to warn the whole country of major catastrophic events
    type of:
    warning
    a message informing of danger
  5. adjective
    mentally perceptive and responsive;"an alert mind"
    alert to the problems”
    synonyms: alive, awake
    aware, cognisant, cognizant
    (sometimes followed by `of') having or showing knowledge or understanding or realization or perception
  6. adjective
    engaged in or accustomed to close observation
    “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”
    synonyms: watchful
    argus-eyed, open-eyed, vigilant, wakeful
    carefully observant or attentive; on the lookout for possible danger
    fly
    (British informal) not to be deceived or hoodwinked
    heads-up, wide-awake
    fully alert and watchful
    lidless, sleepless
    always watchful
    wary
    marked by keen caution and watchful prudence
    awake
    not in a state of sleep; completely conscious
    lively
    full of life and energy
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    Antonyms:
    unalert, unvigilant, unwatchful
    not alert to what is potentially dangerous
    unwary
    not alert to danger or deception
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  7. adjective
    quick and energetic
    synonyms: brisk, lively, merry, rattling, snappy, spanking, zippy
    energetic
    possessing or exerting or displaying energy
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