Alert describes a person or thing extremely aware of what is going on with their surroundings, and is often ready to quickly respond to a possibly dangerous situation.(adjective)
A mother who is at an airport with her children constantly keeping an eye on where they are and requesting they stay close is an example of someone who is being alert.
Alert is defined as being awake and functioning at an energetic level.(adjective)
An example of alert is the doctor who takes a quick nap before his next surgery so that he is well rested and ready to perform at a high level of awareness.
The definition of alert is a state of awareness as to what is going on with one’s surroundings, and often causes a person to be ready to quickly respond to a possibly dangerous situation.(noun)
When a woman is walking down a dark alley at night and keeps checking behind her, it is an example of alert.
Alert means a public method of warning people, either to give them vital information or to report danger.(noun)
An example of an alert are tornado sirens going off when a possible twister is headed in that direction.
The definition of alert is to take action and warn people to be aware of something that has happened in the past, is presently occurring, or will happen in the future.(verb)
When a person runs from door to door ringing bells and shouting about a fire, it is an example of alerting a neighborhood to danger.
See alert in Webster's New World College Dictionary
Origin: Fr alerte, earlier à l'erte < It all' erta, on the watch < alla, at the + erta, a lookout, high (point) < VL *ergere, for L erigere, to erect
See alert in American Heritage Dictionary 4
Origin: French alerte
Origin: , from Italian all' erta, on the lookout
Origin: : alla, to the, on the (from Latin ad illam, to that : ad, to; see ad- + illam, feminine accusative sing. of ille, that, the; see al-1 in Indo-European roots)
Origin: + erta, lookout (from past participle of ergere, to raise, from Latin ērigere; see erect).
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