obligatory, mandatory, required, requisite; see necessary 1.
"compulsory." YourDictionary, n.d. Web. 09 November 2018. <https://thesaurus.yourdictionary.com/compulsory>.
compulsory. (n.d.). Retrieved November 09th, 2018, from https://thesaurus.yourdictionary.com/compulsory
Imposed on one by authority, command, or convention:
Done under force:
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