Definition of alert

The noun alert has 3 senses? (no senses from tagged texts)

(condition of heightened watchfulness or preparation for action; "bombers were put on alert during the crisis")

(a warning serves to make you more alert to danger)

(an automatic signal (usually a sound) warning of danger)

The verb alert has 1 senses? (first 1 from tagged texts)

(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")

The adj alert has 3 senses? (first 1 from tagged texts)

(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")

(quick and energetic; "a brisk walk in the park"; "a lively gait"; "a merry chase"; "traveling at a rattling rate"; "a snappy pace"; "a spanking breeze")

(mentally perceptive and responsive;"an alert mind"; "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")