Dictionary
a•lert
Pronunciation: (u-lûrt'), [key]—
adj.
1. fully aware and attentive; wide-awake; keen:
an alert mind.
2. swift; agile; nimble.
—
n.
1. an attitude of vigilance, readiness, or caution, as before an expected attack.
2. a warning or alarm of an impending military attack, a storm, etc.:
We'd just boarded the bus when the alert sounded.
3. the period during which such a warning or alarm is in effect.
4. 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.
—
v.t.
1. to warn (troops, ships, etc.) to prepare for action.
2. to warn of an impending raid, attack, storm, etc.:
The radio alerted coastal residents to prepare for the hurricane.
3. to advise or warn; cause to be on guard:
to alert gardeners to the dangers of some pesticides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.