Definition: mandatory; obligatory
Part of Speech: Adjective
Synonym(s): involuntary, required
Antonym(s): optional, voluntary, discretionary
1. Since dying is a compulsory activity we’re all going to die one day.
2. Rick had to pass several compulsory exams in order to become a licensed physician.
3. If you are caught driving under the influence more than once, you will be given a compulsory prison sentence.