Required; obligatory; mandatory. / Having the power of compulsion; constraining.

Something that is compulsory or required.

plural of compulsory

The state or quality of being compulsory.

(law, UK, Ireland, New Zealand) The power of a state to expropriate private land within its jurisdiction for public use.

(law, education) A period of time in a child's life during which the child must receive schooling as required by law.

Alternative spelling of noncompulsory

(LGBT, feminism) The idea that heterosexuality can and should be adopted by individuals regardless of their own sexual orientation.

plural of compulsory purchase order

(law, UK, Ireland) An order made, usually for the purchase of land required for a construction project.