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Definition of alert
alert - adj. very attentive or observant; (usually followed by `to') showing acute awareness; mentally perceptive; not unconscious; especially having become conscious; mentally responsive; noun a warning serves to make you more alert to danger; condition of heightened watchfulness or preparation for action; an automatic signal (usually a sound) warning of danger; verb warn or arouse to a sense of danger or call to a state of preparedness.
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