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English definition of “obligatory”

obligatory

adjective uk   /əˈblɪɡ.ə.tər.i/ us    /-tɔːr-/
C1 describes something you must do because of a rule or law, etc.: The medical examination before you start work is obligatory. [+ to infinitive] The statute made it obligatory for all fit males between 14 and 60 to work. C2 expected because it usually happens: Some secret service agents turned up, all wearing the obligatory raincoat and hat.
(Definition of obligatory from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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