1

alert

play
adjective \ə-ˈlərt\

Definition of alert

  1. 1a :  watchful and prompt to meet danger or emergency an alert guard trying to stay alert to possible problemsb :  quick to perceive and act mentally alert

  2. 2 :  active, brisk elicited an alert response

alertly

adverb

alertness

noun

Examples of alert in a sentence

  1. An alert guard stopped the robbers.

  2. He was tired and had trouble staying alert while he was driving.

  3. She wasn't mentally alert enough to answer the questions.

  4. An alert watchdog guarded the door.

Origin and Etymology of alert

Italian all'erta, on the watch, literally, on the height


First Known Use: 1618

Synonym Discussion of alert

watchful, vigilant, wide-awake, alert mean being on the lookout especially for danger or opportunity. watchful is the least explicit term. the watchful eye of the department supervisor vigilant suggests intense, unremitting, wary watchfulness. eternally vigilant in the safeguarding of democracy wide-awake applies to watchfulness for opportunities and developments more often than dangers. wide-awake companies latched onto the new technology alert stresses readiness or promptness in meeting danger or in seizing opportunity. alert traders anticipated the stock market's slide

intelligent, clever, alert, quick-witted mean mentally keen or quick. intelligent stresses success in coping with new situations and solving problems. an intelligent person could assemble it fast clever implies native ability or aptness and sometimes suggests a lack of more substantial qualities. clever with words alert stresses quickness in perceiving and understanding. alert to new technology quick-witted implies promptness in finding answers in debate or in devising expedients in moments of danger or challenge. no match for his quick-witted opponent

2

alert

noun

Definition of alert

  1. 1 :  a state of careful watching and readiness especially for danger or opportunity on 24-hour alert

  2. 2a :  an alarm or other signal of danger traffic alerts They sounded the alert.b :  an urgent notice … an alert to parents … about new immunization requirements. — Ann Schrader

  3. 3 :  the period during which an alert is in effect

on the alert

  1. :  looking for or expecting something (such as danger or an opportunity) Drivers need to be on the alert for icy condition. always on the alert for a good bargain

Examples of alert in a sentence

  1. They sounded an alert when enemy planes were approaching the city.

  2. Medical officials have put out an alert to hospitals to look out for the virus.

  3. The government has issued a terrorism alert.

Origin and Etymology of alert

see 1alert


First Known Use: 1801


3

alert

verb

Definition of alert

  1. transitive verb
  2. 1 :  to call (someone) to a state of readiness :  warn alerted the school board of a possible teachers' strike alert the authorities

  3. 2 :  to make (someone) aware of something alerted the public to the dangers of pesticides

Examples of alert in a sentence

  1. Several neighbors alerted the authorities when they noticed strangers acting suspiciously.

  2. The governor alerted island residents that a hurricane was coming.

  3. The teacher alerted the students that tests would be given the next day.

Origin and Etymology of alert

see 1alert


First Known Use: circa 1868


ALERT Defined for English Language Learners

1

alert

play
adjective \ə-ˈlərt\

Definition of alert for English Language Learners

  • : able to think clearly and to notice things


2

alert

noun

Definition of alert for English Language Learners

  • : something (such as a message or loud sound) that tells people there is some danger or problem : an alarm or signal of danger

  • : the state of being ready for something you have been warned about (such as an attack)


3

alert

verb

Definition of alert for English Language Learners

  • : to give (someone) important information about a possible problem, danger, etc. : to warn (someone)

  • : to make (someone) aware of something


ALERT Defined for Kids

1

alert

play
adjective \ə-ˈlərt\

Definition of alert for Students

  1. 1 :  watchful and ready especially to meet danger But he was alert at night, too, on the road, always listening intently … — Lois Lowry, The Giver

  2. 2 :  quick to understand and act An alert reader noticed the error in grammar.

alertly

adverb The prairie dog sat alertly beside the opening of its burrow.

alertness

noun

2

alert

play
noun

Definition of alert for Students

  1. 1 :  an alarm or signal of danger The police issued an alert.

  2. 2 :  the period during which an alert is in effect We stayed indoors during the alert.

on the alert

  1. :  watchful against danger … the remark had set us all on the alert, straining ears and eyes … — Robert Louis Stevenson, Treasure Island


3

alert

play
verb

Definition of alert for Students

alerted

;

alerting

  1. :  to make aware of a need to get ready or take action :  warn The siren alerted us that a tornado was approaching.



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