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English definition of “mandatory”

mandatory

adjective uk   /ˈmæn.də.tər.i/ us    /-tɔːr.i/ formal
describes something that must be done, or is demanded by law: The minister is calling for mandatory prison sentences for people who assault police officers. Athletes must undergo a mandatory drugs test before competing in the championship. In 1991, the British government made it mandatory to wear rear seat belts in cars.
(Definition of mandatory from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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