“Compulsory” means something that must be done and is not optional, usually because of a law, rule, or authority. It’s very close to “mandatory” or “required.”

Core meaning

  • If something is compulsory, you have no real choice about doing it.
  • It often involves a rule, law, school policy, or official requirement.

Think of it like this:

Optional = you can choose.
Compulsory = you must do it.

Simple examples

  • Compulsory education : Children are legally required to go to school up to a certain age.
  • Compulsory helmets for motorcyclists: The law says you must wear a helmet when riding.
  • Compulsory attendance : You must attend (for example, a meeting or a class).

In a sentence:

  • “Wearing a seatbelt is compulsory in many countries.”
  • “Math is a compulsory subject this year.”

Nuance vs similar words

  • “Compulsory” usually feels formal and often suggests a legal or official rule.
  • “Required” is more general and can be used in casual or formal situations.
  • “Mandatory” is very close in meaning and also sounds formal/official.

Quick recap (TL;DR)

  • “Compulsory” = must do it, not optional.
  • Used for laws, school rules, safety rules, and official requirements.