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English definition of “compulsory”

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compulsory

adjective uk   /kəmˈpʌl.sər.i/ us    /-sɚ-/
B2 If something is compulsory, you must do it because of a rule or law: Swimming was compulsory at my school. The law made wearing seat belts in cars compulsory.
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compulsorily
adverb uk   /-əl.i/ us  
Patients can now be compulsorily detained in hospital only under tightly drawn criteria.
(Definition of compulsory from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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