contractual

compulsory

kəmˈpʌls(ə)ri

adjective

required by law or a rule; obligatory.

compulsory military service

obligatory,mandatory,required,requisite,necessary,essential,statutory,prescribed,imperative,enforced,demanded,binding,forced,unavoidable,inescapable,incumbent,enforceable,contractual,stipulated,set,de rigueur

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