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- DictionaryA·lert/əˈlərt/
adjective
- 1. quick to notice any unusual and potentially dangerous or difficult circumstances; vigilant: "an alert police officer discovered a truck full of explosives"
noun
- 1. the state of being watchful for possible danger: "security forces were placed on alert"
verb
- 1. warn (someone) of a danger, threat, or problem, typically with the intention of having it avoided or dealt with: "he alerted people to the dangers of smoking"