Answer: prescriptive

AnswerCrossword Clue
prescriptiveEstablished by long-standing custom or usage
prescriptive(of a right, title, or institution) Having become legally established or accepted by long usage or the passage of time
prescriptiveAttempting to impose rules of correct usage on the users of a language
prescriptiveOf or relating to the imposition or enforcement of a rule or method
prescriptiveserving to prescribe; (law) acquired through uninterrupted possession