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 lay-offs opposite voluntary
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NAmE//kəmˈpʌlsərəli//
adverb Over 600 workers were compulsorily laid off.See compulsory in the Oxford Advanced Learner's DictionaryCheck pronunciation: compulsory