What does compulsory mean?
Compulsory is an adjective describing something that is required by law, rule, or official authority and therefore cannot be avoided or declined at will. Compulsory education means every child of a certain age must attend school; compulsory military service means citizens are legally obliged to serve. The word appears constantly in formal contexts — legislation, school curricula, employment contracts, insurance requirements — and contrasts directly with optional, voluntary, and discretionary. Its tone is neutral rather than harsh: calling something compulsory states a fact about enforcement, not disapproval. Derived from the Latin verb pellere, meaning 'to drive,' through the past participle pulsus ('driven'), the word entered English in the early seventeenth century and shares ancestry with impulse, expulsion, propulsion, and repulsion — all words involving some kind of driving force. Because so much civic life hinges on obligations people did not personally choose, compulsory remains one of the most practical adjectives for discussing laws, rules, and institutional demands.
adjectiveRequired by a law, rule, or other authority; mandatory. Something compulsory must be done or complied with, rather than being left to individual choice.
- Required by law, rules, or authority; mandatory and enforced, not optional.
- (Of a course or subject) prescribed as part of a curriculum that all students must take.
"Wearing a seat belt has been compulsory for front-seat passengers since 1983."
"Education is compulsory for children between the ages of five and sixteen."
"Statistics is a compulsory module in the first year of the economics degree."
In ancient Rome, the Latin verb 'pellere' meant to drive or beat — and its past participle 'pulsus' ('driven') is the direct ancestor of 'compulsory', a word that literally means 'forced forward.'
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of compulsory
Compulsory derives from the Late Latin compulsorius, formed from the past participle pulsus of the Latin verb pellere, meaning 'to drive, push, or force.' It entered English in the early seventeenth century, initially carrying the sense of using force or constraint before settling into its modern meaning of legally or officially required. It shares this Latin root with cognates such as impulse, expulsion, propulsion, and repulsion.
How compulsory is actually used
Formal to neutral register; frequent in legal, educational, and administrative writing. In British English it commonly describes schooling, insurance, and voting; American English often prefers 'mandatory' in similar contexts. It carries no negative connotation — it signals enforced obligation rather than coercion in a pejorative sense.
Easily confused with compulsory
Mandatory and compulsory both mean required, but 'mandatory' is more common in legal and administrative contexts, while 'compulsory' often emphasizes enforced obligation over personal choice.
'Obligatory' stresses the existence of an obligation (often social or moral), whereas 'compulsory' implies enforcement by law or rule with penalties for non-compliance.