Mandatory

a.	1.	Containing a command; preceptive; directory.
	2.	Obligatory; compulsory; required by authority.
	3.	(Law) Not optional; not able to be modified or disregarded; as, seven mandatory clauses in the contract.
n.	1.	Same as Mandatary.

Noun	1.	mandatory - the recipient of a mandate Synonyms: mandatary
	2.	mandatory - a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they ar able to stand by themselves Synonyms: mandate
Adj.	1.	mandatory - required by rule; "in most schools physical education are compulsory"; "attendance is mandatory"; "required reading" Synonyms: compulsory, required

absolute, authoritative, binding, canonical, choiceless, commanded, commanding, compelling, compulsatory, conclusive, de rigueur, decisive, decretory, demanded, dictated, didactic, entailed, essential, exigent, final, forced, formulary, hard and fast, hard-and-fast, imperative, imperious, importunate, imposed, indispensable, inevitable, instructive, involuntary, irrevocable, mandated, must, necessary, necessitous, needed, needful, official, peremptory, preceptive, prescribed, prescript, prescriptive, regulation, requisite, rubric, standard, statutory, ultimate, urgent, without appeal, without choice