mandatory
/ˈmændəˌtɔɹi/
required by law or rules; compulsory
mandatory in a sentence
“Security training is mandatory for all employees.”
Origin of mandatory
Latin mandatum command (from mandare to order) + -ory
Related Words
discretionary
available for use at one's own judgment
optional
available to be chosen but not required
ancillary
providing necessary support; supplementary
predicate
to base something on; require as a precondition
entail
to involve something as a necessary consequence
stipulate
to specify as a condition or requirement