"mandatory" in the noun sense
1. mandatary, mandatory
the recipient of a mandate
2. mandate, mandatory
a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they are able to stand by themselves
"mandatory" in the adjective sense
1. compulsory, mandatory, required
required by rule
"in most schools physical education is compulsory"
"attendance is mandatory"
"required reading"
Source: WordNet® (An amazing lexical database of English)
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