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1. Definition + Rich Everyday Explanation
Compulsory (adjective) = required by law, rule, or authority; something you must do whether you want to or not.
When something is compulsory, you have no choice — it’s mandatory, obligatory, not optional. This word carries a sense of external force: someone with authority has decided you must do it, and there are usually consequences if you refuse.
“Compulsory” is used everywhere in society — education, employment, military service, voting in some countries, insurance, and institutional rules. It describes the line between optional and mandatory. When people say something is compulsory, they’re signaling “don’t argue, just comply” — this isn’t a suggestion or recommendation.
The word often appears in formal or official contexts — school policies, employment contracts, government regulations. It’s stronger than “necessary” or “important” because it implies enforcement and authority. If attendance is compulsory, missing it brings punishment. If insurance is compulsory, driving without it is illegal.
Socially, calling something “compulsory” can feel restrictive or even oppressive, depending on context. People often debate whether things should be compulsory (vaccination, voting, military service) because it touches on freedom versus collective responsibility.
Examples from the street:
- “Attendance at the meeting is compulsory — no excuses” → you must be there, or face consequences
- “Military service is compulsory for all men in that country” → every male citizen must serve; it’s the law
- “Wearing a helmet is compulsory on motorcycles” → it’s legally required, not just recommended for safety
2. Most Common Patterns
- compulsory + noun → education, attendance, service, insurance, retirement
- be compulsory → the standard way to state something is mandatory
- make something compulsory → establish a requirement officially
- compulsory for + person/group → required for a specific category of people
- compulsory to + verb → required to perform an action
3. Idioms
Note: There are no common idioms directly containing “compulsory” — these are related expressions:
- have no choice but to → must do something because there’s no alternative
Example: “I had no choice but to attend — it was compulsory.”
- a must → something required or essential (more informal than compulsory)
Example: “Safety training is a must for all new employees.”
4. Example Sentences
- Compulsory education in this country lasts until age 16
→ Children must legally attend school until they turn sixteen.
- Wearing seat belts is compulsory for all passengers
→ Everyone in the vehicle must buckle up; it’s the law.
- The government decided to make vaccination compulsory for healthcare workers
→ Authorities established that medical staff must get vaccinated; it’s no longer optional.
- The training session is compulsory for all new employees
→ Every person starting work must attend; there are no exceptions.
- It is compulsory to wear a uniform at this school
→ Students must dress in the official clothing; they have no choice.
- Compulsory military service builds discipline and national unity, supporters argue
→ Required time in the armed forces creates structure and shared identity, according to advocates.
- The course includes one compulsory module on ethics
→ Students must complete the ethics section; they cannot skip it.
- Compulsory insurance protects everyone on the road
→ Legally required coverage ensures all drivers can compensate victims of accidents.
- Voting is compulsory in Australia — citizens must participate in elections
→ Every eligible person must cast a ballot; failing to vote brings penalties.
- The company made annual health checks compulsory for staff over 50
→ Employees above fifty must undergo yearly medical examinations; it’s now a requirement.
5. Personal Examples
- Homework is compulsory in my class — students who don’t complete it face consequences
→ Assignments must be finished; there’s no way around it, and missing work brings penalties.
- Attending parent-teacher conferences should be compulsory for all families
→ Every guardian ought to be required to come; it’s essential for student success.
6. Register: Formal/Neutral
✔ Native usage tips
- “Compulsory” is more formal than “mandatory” but less technical than “obligatory”
- It’s commonly used in official documents, policies, and institutional announcements
- In casual speech, people often say “you have to” or “it’s required” instead
- The word signals finality — when something is compulsory, debate is over
✔ Similar expressions / words
- Mandatory → essentially identical meaning; slightly more common in American English
- Obligatory → more formal and technical; often used in legal or academic contexts
- Required → simpler and more neutral; less emphasis on authority and enforcement
