B2adjectiveformal5K

Compulsory

UK /["/kəmˈpʌlsəri/"]/US /["/kəmˈpʌlsəri/"]/

Definition

that must be done because of a law or a rule

In simple words: Something that must be done or followed.

Examples

  • English is a **compulsory subject** at this level.
  • **compulsory education/schooling**
  • The strikers are protesting against the threat of compulsory redundancies.
  • It is compulsory for all motorcyclists to wear helmets.

Usage notes

Used in formal contexts, often in legal or academic settings. Avoid using in casual conversation; instead, use 'required' or 'mandatory' in those contexts.

Grammar pattern

compulsory + noun

Memory hint

Think of 'compulsory' as 'company policy' — something you have to follow.

Collocations

  • compulsory education
  • compulsory attendance
  • compulsory courses
  • compulsory insurance

Synonyms

  • mandatory

Antonyms

  • optional
  • voluntary
  • discretionary

Common mistakes

  • Confused with 'optional'; it means the opposite.
  • Often misspelled as 'compolsory'.
  • Used incorrectly as an adverb; it is an adjective.