Definition of compulsory adjective from the Oxford Advanced Learner's Dictionary

 

compulsory

 adjective
adjective
BrE BrE//kəmˈpʌlsəri//
 
; NAmE NAmE//kəmˈpʌlsəri//
 
Subjects and courses
 
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that must be done because of a law or a rule synonym mandatory It is compulsory for all motorcyclists to wear helmets. English is a compulsory subject at this level. compulsory education/schooling compulsory redundancies opposite voluntary See related entries: Subjects and courses Word Origin early 16th cent. (as a noun denoting a legal mandate which had to be obeyed): from medieval Latin compulsorius, from compuls- ‘driven, forced’, from the verb compellere, from com- ‘together’ + pellere ‘drive’. Extra examplesIt is compulsory for all motorcyclists to wear helmets. The strikers are protesting against the threat of compulsory redundancies. There is no compulsory education in this part of Africa.
See the Oxford Advanced American Dictionary entry: compulsory

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