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English definition of “compulsory”

compulsory

adjective     /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.Court cases, orders and decisionsDuty, obligation and responsibility compulsorily     /-əl.i/ adverb Patients can now be compulsorily detained in hospital only under tightly drawn criteria.Court cases, orders and decisionsDuty, obligation and responsibility
(Definition of compulsory adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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