adjective

compulsory

kuhm-PUHL-suh-ree/kəmˈpʌlsəri/

Required by a rule, law, or authority.

Wearing a hard hat is compulsory before the worker enters the construction site.

Compulsory: worker entering construction site must put on hard hat; gate attendant points to blue circular pictogram sign with white hard-hat symbol, worker complies.
Etymology

The pieces lead to the idea of driving together or forcing. Something compulsory is done under compulsion: a rule or authority requires it rather than leaving it to choice.

In context

misesmedia49:10
a very common law at the time which was compulsory sterilization of people who are judged adjudicated to be feeble-minded
Fighting Back: My Legal and Ethical Battle against Covid Mandates | Todd Zywicki

More examples

  • School attendance is compulsory until a certain age.
  • The university makes a writing course compulsory for first-year students.
  • Military service is compulsory in some countries.

Forms

compulsory

compulsion noun — The act of forcing someone to comply.

Similar words

mandatory
Often emphasizes a requirement imposed by an official authority.
obligatory
Can also describe duties arising from custom or social expectations.