- fully aware and attentive; wide-awake; keen: an alert mind.
- swift; agile; nimble.
- an attitude of vigilance, readiness, or caution, as before an expected attack.
- a warning or alarm of an impending military attack, a storm, etc.: We'd just boarded the bus when the alert sounded.
- the period during which such a warning or alarm is in effect.
- to warn (troops, ships, etc.) to prepare for action.
- to warn of an impending raid, attack, storm, etc.: The radio alerted coastal residents to prepare for the hurricane.
- to advise or warn; cause to be on guard: to alert gardeners to the dangers of some pesticides.
- on the alert, on guard against danger; in readiness; vigilant: The state police are on the alert for an escaped convict believed to be in the area.
Origin of alert
Synonyms for alertSee more synonyms for on Thesaurus.com
Antonyms for alert
Examples from the Web for alerted
Contemporary Examples of alerted
She then changed her passwords and ended all contact with the Iranian Bolton and then alerted the office of the real one.Iran Is Using a Neocon to Hack Its Foes
May 30, 2014
It alerted people to the fact that a lot had become complacent about the possibility of a bear attack.In Florida, Sprawling Humans Confront the Bears Who Lived There First
March 22, 2014
After one user spotted footsteps in the snow near the edge of a cliff, Tomnod alerted law enforcement.Now You Can Hunt for Flight 370
March 12, 2014
This is not the first time the Washington Post has alerted the White House to the error.No, Women Don’t Make Less Money Than Men
Christina Hoff Sommers
February 1, 2014
He also alerted the Wall Street Journal in an interview that was the first time I met Sharon.My Moments With Ariel Sharon
January 11, 2014
Historical Examples of alerted
He could feel the alerted tension of the four as the golden eyes glowed at him.Join Our Gang?
Sterling E. Lanier
You see, Mr. Masterson's alerted people at the Commissioner's office.The Best Made Plans
Everett B. Cole
"They'll be alerted down there for a reconnaissance sally," he said.Control Group
All detachments in the area have been alerted to watch for the Sampaguita.
As Zircon had said, they had to assume the whole colony was alerted.
- vigilantly attentivealert to the problems
- brisk, nimble, or lively
- an alarm or warning, esp a siren warning of an air raid
- the period during which such a warning remains in effect
- on the alert
- on guard against danger, attack, etc
- watchful; readyon the alert for any errors
- to warn or signal (troops, police, etc) to prepare for action
- to warn of danger, an attack, etc
Word Origin for alert
"on the watch," 1590s, from French alerte "vigilant" (17c.), from phrase à l'erte "on the watch," from Italian all'erta "to the height," from erta "lookout, high tower," noun use of fem. of erto, past participle of ergere "raise up," from Latin erigere "raise" (see erect). The adjective is attested from 1610s, the noun from 1803, and the verb from 1868. Related: Alerted; alerting.
see on the alert.