Compulsory: adj. necessary by law(s) and/or rule(s)
Compulsory figure skating moves to qualify for the next level of expertise is an example of necessary rules being followed to qualify for a skating skill set. Compulsory exams to qualify for certain education levels also exist. Anything compulsory is necessary by law(s) and/or rule(s) and must be satisfied or followed to be within the law(s) and/or rule(s).
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