Canon law
Canonical jurisprudential theory generally follows the principles of Aristotelian-Thomistic legal philosophy. While the term "law" is never explicitly defined in the Code, the Catechism of the Catholic Church cites Aquinas in defining law as "...an ordinance of reason for the common good, promulgated by the one who is in charge of the community" and reformulates it as "...a rule of conduct enacted by competent authority for the sake of the common good."

Q: What term expresses the idea of law derived from Aquinas as interpreted by the Catechism?
a rule of conduct