mandatory

In the US, attending school through the twelfth grade, driving on the right side of the road, and obtaining a social security number are all mandatory. The phrase "mandatory requirement" is redundant.

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. Mandatory is often used in opposition to optional. If you want to compete with the swim team at school, weeknight practices are mandatory, meaning you have to go, though the Saturday dawn swim practice remains optional, meaning it's up to you.

Definitions of mandatory
  1. adjective
    required by rule
    “attendance is mandatory
    synonyms: compulsory, required
    obligatory
    morally or legally constraining or binding
  2. noun
    the recipient of a mandate
    synonyms: mandatary
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    type of:
    receiver, recipient
    a person who receives something
  3. noun
    a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they are able to stand by themselves
    synonyms: mandate
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    examples:
    Palestine
    a former British mandate on the east coast of the Mediterranean; divided between Jordan and Israel in 1948
    type of:
    district, dominion, territorial dominion, territory
    a region marked off for administrative or other purposes
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