1. (noun) alert, qui vive
condition of heightened watchfulness or preparation for action
"bombers were put on alert during the crisis"
2. (noun) alert, alerting
a warning serves to make you more alert to danger
3. (adj) alarm, alert, warning signal, alarum
an automatic signal (usually a sound) warning of danger
4. (adj) alert, watchful
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"
5. (adj) alert, brisk, lively, merry, rattling, snappy, spanking, zippy
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"
6. (verb) alert, alive(p), awake(p)
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"
7. (verb) alarm, alert
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"
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Definition of 'ALERT' 
