mandatory

Required or commanded by authority; obligatory.

Of, having the nature of, or containing a mandate.

Holding a League of Nations mandate over a territory.

A mandatary.

Of the nature of a mandate; containing a command or mandate; directory.

Same as mandatary.

Same as mandatary.

Containing a command; preceptive; directory.

Obligatory; compulsory; required by authority.

Not optional; not able to be modified or disregarded.