<p><strong>Adjective</strong></p><ul><li>required;</li><li>mandatory;</li><li>obligatory: compulsory education.</li><li>Antonyms: voluntary; using compulsion; compelling; constraining: compulsory measures to control rioting.</li><li>Antonyms: voluntary.</li></ul><p><strong>Noun</strong></p><ul><li>plural compulsories.</li><li>something, as an athletic feat, that must be performed or completed as part of a contest or competition: The ice skater received a higher score on the compulsories than on her freestyle performance.</li></ul>