Meaning of “mandatory” in the English Dictionary

american-english dictionary

"mandatory" in British English

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mandatoryadjective

uk /ˈmæn.də.tər.i/ us /ˈmæn.də.tɔːr.i/ formal

Something that is mandatory must be done, or is demanded by law:

Athletes must undergo a mandatory drugs test before competing in the championship.
In 1991, the British government made it mandatory to wear rear seat belts in cars.

(Definition of “mandatory” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mandatory" in American English

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mandatoryadjective [ not gradable ]

us /ˈmæn·dəˌtɔr·i, -ˌtoʊr·i/

made necessary, usually by law or by some other rule:

The test includes a mandatory essay question.

(Definition of “mandatory” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"mandatory" in Business English

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mandatoryadjective

uk /ˈmændətəri/ us /ˈmændəˌtɔri/

used to describe something that must be done, usually because the law states that it is necessary:

mandatory for sb to do sth They would make it mandatory for everyone to have health insurance.
See also

(Definition of “mandatory” from the Cambridge Business English Dictionary © Cambridge University Press)