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compulsory

adjective
 
 
/kəmˈpʌl.sər.i/ US  /-sɚ-/

Definition

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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