In a manner that is compulsory, mandatory, or enforced by force; under compulsion.
From 'compulsatory' (adjective, meaning mandatory) plus the adverbial suffix '-ly.' The root is Latin 'compellere' (to drive together, compel).
Legal and official documents love 'compulsatorily'—it sounds precisely mandatory and leaves no room for interpretation, which is exactly what legislators want when making something required by law.
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