compulsory

Definitions

Required by law or a rule; obligatory.

Involving or employing compulsion; coercive.

Examples

Wearing a seatbelt while driving is compulsory by law.

Mathematics is a compulsory subject for all students in their first year of high school.

Synonyms

mandatory obligatory required compelled binding necessary essential

Antonyms

optional voluntary discretionary elective noncompulsory unforced free