Mandatory

usgb/ˈmændətɔːri/Volume
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LampPro Tip 1/3
Beyond LawsPlay
Mandatory isn't used only for laws but for rules in organizations, schools, or clubs. SlideAttendance is mandatory for all members at the club meetings.
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Safety RelatedPlay
'Mandatory' is often used in safety contexts to mean 'necessary for safety'. SlideIt's mandatory to wash your hands before serving food.
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Not OptionalPlay
When something is mandatory, you cannot choose whether to follow it or not. SlideCompleting this course is mandatory for graduation.