from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Vigilantly attentive; watchful: alert to danger; an alert bank guard. See Synonyms at aware.
- adj. Mentally responsive and perceptive; quick.
- adj. Brisk or lively in action: the bird's alert hopping from branch to branch.
- n. A signal that warns of attack or danger: Sirens sounded the alert for an air raid.
- n. A condition or period of heightened watchfulness or preparation for action: Nuclear-armed bombers were put on alert during the crisis.
- transitive v. To notify of approaching danger or action; warn: a flashing red light that alerted motorists to trouble ahead.
- idiom on the alert Watchful and prepared for danger, emergency, or opportunity: bird watchers on the alert for a rare species.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Attentive; awake; on-guard.
- n. An alarm.
- n. A notification of higher importance than an advisory.
- v. To give warning to.
from the GNU version of the Collaborative International Dictionary of English
- adj. Watchful; vigilant; active in vigilance.
- adj. Brisk; nimble; moving with celerity.
- n. An alarm from a real or threatened attack; a sudden attack; also, a bugle sound to give warning.
from The Century Dictionary and Cyclopedia
- Active in vigilance; watchful; vigilantly attentive.
- Moving with celerity; brisk; active; nimble: as, “an alert young fellow,” Addison, Spectator, No. 403.
- Lively, agile, quick, prompt, ready, spry.
- n. An attitude of vigilance; watch; guard: especially in the phrase on or upon the alert, upon the watch; on the lookout; guarding against surprise or danger: as, “the readiness of one on the alert,” Dickens.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. engaged in or accustomed to close observation
- adj. mentally perceptive and responsive
- v. warn or arouse to a sense of danger or call to a state of preparedness
- adj. quick and energetic
- n. a warning serves to make you more alert to danger
- n. condition of heightened watchfulness or preparation for action
- n. an automatic signal (usually a sound) warning of danger
However, in this alert is an unusual warning about the state of Durango:
A travel "alert" is less serious than a full "travel warning," which could have big implications.
An e-mail alert from the technical office went out to all House staff members notifying them of the problem.
While he said that the travel alert is the "lowest level of warning that the State Department issues," Americans abroad should be mindful of their surroundings.
Why is it big news now that they might actually help you remain alert?
Yet I remain alert to the potential dangers of trying to figure out what a poet intended.
HAMBURG, Germany — The Islamic militant whose disclosures under U.S. interrogation in Afghanistan triggered Europe's terror alert is an old friend of a man convicted in the 9/11 attacks and, as the strikes were being planned, frequented the same mosque where the Hamburg-based plotters often met, officials say.
And being relaxedly alert is extremely important for learning to take place, methinks.
In the aftermath of the arrest of terrorist suspect Farooque Ahmed and the revelation of an alleged plot to bomb multiple Metro stations, officials underscored the need for customers to remain alert to any suspicious activity, stressing that a single observation could prove essential.
An World Health Organization official announced the spread of the plague in the Libyan city of Tobruk on the Mediterranean coast after receiving an alert from the Libyan authorities.