Statutory

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Middle English: from Old French statut, from late Latin statutum, neuter past participle of Latin statuere ‘set up’ from status ‘standing’ (see status).

wiktionary

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statute +‎  -ory

etymonline

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statutory (adj.)

"pertaining to statues, depending on statute for authority, required by statute," 1717, from statute + -ory. Statutory rape attested from 1873; in U.S., "sexual intercourse with a female below the legal age of consent, whether forced or not." Related: Statutorily.