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English definition of “warrant”

warrant

verb uk   /ˈwɒr.ənt/ us    /ˈwɔːr-/

warrant verb (MAKE NECESSARY)

[T] to make a particular activity necessary: Obviously what she did was wrong, but I don't think it warranted quite such severe punishment. It's a relatively simple task that really doesn't warrant a great deal of time being spent on it.
See also
Essential or necessary

warrant verb (PROMISE)

[I or T] old-fashioned to say that you are certain about somethingMaking and breaking promises and commitments

warrant

noun uk   /ˈwɒr.ənt/ us    /ˈwɔːr-/

warrant noun (DOCUMENT)

[C] an official document, signed by a judge or other person in authority, which gives the police permission to search someone's home, arrest a person, or take some other action: a search warrant Judge La Riva had issued an arrest warrant/a warrant for his arrest.Official documentsArresting and chargingThe police generally

warrant noun (REASON)

[U] old-fashioned a reason for doing something: There's no warrant for that sort of behaviour!Reasons and explanations
(Definition of warrant from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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