Required by law or rules; compulsory
A person or country receiving a mandate
a high school diploma is mandatory
(In the United Kingdom) a grant comprising tuition fees and a means-tested living allowance given by a local education authority (in Scotland, the Scottish Education Department) to a student enrolled on a first-degree or equivalent full-time higher-education course.
= mandatory award.
Compulsory retirement of employees at a set age, especially as required by law; the age at which this occurs.
Not required by law or mandate; voluntary