alert noun definition in Terrorism topic from the Oxford Advanced Learner's Dictionary

alert

 noun: Terrorism topic
1 [singular, uncountable] a situation in which people are watching for danger and ready to deal with it Police are warning the public to be on the alert for suspicious packages. More than 5 000 troops have been placed on (full) alert.2 [countable] a warning of danger or of a problem a bomb/fire alert

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