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TOEFL IELTS BNC: 3997 COCA: 12735

compulsory

Word family
com·pul·so·ry /kəmˈpʌlsəri/ ●●○ adjectiveadj  
MUSTsomething that is compulsory must be done because it is the law or because someone in authority orders you to 规定的;强制的,强迫的;义务的 voluntary
 the threat of compulsory redundancies
强制性裁员的威胁
compulsory schooling/education
 11 years of compulsory education
11年制义务教育
 Car insurance is compulsory.
汽车保险是强制性的。
see thesaurus at necessary
compulsorily adverbadv
nTHESAURUS
compulsory if something is compulsory, you must do it because of a rule or law
Maths and English are compulsory for all students.
Compulsory education was introduced in 1870.
Wearing a seat belt is compulsory.
It is now compulsory for anyone claiming state benefit to register with a job centre.
obligatory [not usually before noun] if something is obligatory, you must do it because of a rule or law. Obligatory is more formal than compulsory
It is now obligatory for all competitors to wear face protectors.
Evening dress is usual, but not obligatory.
Military service is obligatory for all men between 18 and 27.
mandatory if something is mandatory, you must do it because it is the law. Mandatory is more formal than compulsory and sounds stronger
Drug smuggling carries a mandatory death sentence.
In some countries, wearing helmets is mandatory for all cyclists.
not compulsory
optional if something is optional, you can choose whether to do it or not
You don’t have to do French – it’s optional.
The holiday price includes optional excursions such as an evening cruise on the lake.
General Studies is optional for sixth-form students.
voluntary done because you want to do it and not because you have to – used especially about things that you do because you think they will help other people or be useful
The programme is entirely voluntary, and no one will be forced to join.
The charity is funded by voluntary donations.
Examples from the Corpus
From Longman Business Dictionary
compulsorycom·pul·so·ry /kəmˈpʌlsəri/ adjectiveadj
something that is compulsory must be done according to a law or rule
The company has introduced compulsory overtime for all its workers.
com·pul·so·ry adjectiveadjn THESAURUS1
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