The meaning of MANDATORY is required by a law or rule : obligatory. How to use mandatory in a sentence. Did you know?

MANDATORY definition: 1. Something that is mandatory must be done, or is demanded by law: 2. Something that is mandatory…. Learn more.

Mandatory definition: authoritatively ordered; obligatory; compulsory.. See examples of MANDATORY used in a sentence.

Nov 1, 2025 · mandatory (comparative more mandatory, superlative most mandatory) obligatory; required or commanded by authority. synonyms, antonyms quotations Synonyms: compulsory, …

Definition of mandatory adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

There are six meanings listed in OED's entry for the word mandatory, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

1. Required or commanded by authority; obligatory: Attendance at the meeting is mandatory. 2. Of, having the nature of, or containing a mandate. 3. Holding a League of Nations mandate …

adj. authoritatively ordered; obligatory; compulsory: It is mandatory that all students take two years of math. pertaining to, of the nature of, or containing a command. Law permitting no …

If an action or procedure is mandatory, people have to do it, because it is a rule or a law.

A mandatory action is something that is required, obligatory, or compulsory. Like letting your Great Aunt Edna pinch your cheeks or passing gym to get your diploma.