Longman Dictionary of Contemporary English homepage

compulsory

 adjective
     
com‧pul‧so‧ry
something that is compulsory must be done because it is the law or because someone in authority orders you to [= mandatory; ↪ voluntary]:
compulsory schooling/education
11 years of compulsory education
Car insurance is compulsory.
—compulsorily adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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