statutory

adj. of or pertaining to a statute; conforming to a statute, authorized by a statute

A statute is a formal, written law of a country or state, written and enacted by its legislative authority, perhaps to then be ratified by the highest executive in the government, and finally published. Typically, statutes command, prohibit, or declare policy. Statutes are sometimes referred to as legislation or "black letter law."
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Adjective
1. relating to or created by statutes; "statutory matters"; "statutory law"
(pertainym) legislative act, statute
2. prescribed or authorized by or punishable under a statute; "statutory restrictions"; "a statutory age limit"; "statutory crimes"; "statutory rape"
(similar) legal

(a.)
Enacted by statute; depending on statute for its authority; as, a statutory provision.
  

Synonyms and related words:
actionable, applicable, authoritative, authorized, binding, canonical, competent, constitutional, dictated, didactic, formulary, hard and fast, instructive, judicial, juridical, just, justiciable, kosher, lawful, lawmaking, legal, legislative, legit, legitimate, licit, mandatory, official, preceptive, prescribed, prescript, prescriptive, regulation, rightful, rubric, sanctioned, standard, valid, within the law