mandatory: Meaning and Definition of

man•da•to•ry

1. authoritatively ordered; obligatory; compulsory: It is mandatory that all students take two years of math.
2. pertaining to, of the nature of, or containing a command.
3. permitting no option; not to be disregarded or modified: a mandatory clause.
4. having received a mandate, as a nation.

1. mandatary.