prescriptive

adjective

• 1relating to the imposition or enforcement of a rule or method:these guidelines are not intended to be prescriptive
• Linguistics attempting to impose rules of correct usage on the users of a language:a prescriptive grammar bookOften contrasted with descriptive.

• 2(of a right, title, or institution) having become legally established or accepted by long usage or the passage of time:a prescriptive right of way
• archaic arising from long-standing custom or usage:for her own mother she felt no more than a prescriptive affection