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A determinatio is an authoritative determination by the legislator concerning the application of practical principles, that is not necessitated by deduction from natural or divine law but is based on the contingencies of practical judgement within the possibilities allowed by reason.
In natural law jurisprudence, determinatio is the process of making natural law into positive law In Catholic canon law, determinatio is the act by which natural law or divine positive law is made determinate in the canonical legal system as specific norms of law, although the content of such law is still essentially that of divine law, which, together with canon law, forms "a single juridical system of law".
The general norms of divine or natural law serve as "shaping factors" and "a necessary basis" for the human-made canon law, but such general norms in themselves cannot have a greater legal effect until they are made into specific human laws, since the norms of divine law are "general and non-specific".
But in the movement from the general to the concrete, there are sometimes many possibilities; that is, divine or natural law can be made concrete in may different ways, and all the legitimate alternatives are in line with the requirements of divine law. Wherefore the legislator must make a determinatio and "opt or choose among them".
- Finnis, John. Aquinas, 266-271.
- Hervada, Introduction, pg. 33
- Waldron, Jeremy. Torture, Suicide, and Determinatio main page, Social Science Research Network. Accessed 22 March 2016.
- Hervada, Introduction, pg. 34
- Natural Law Theories, Stanford Encyclopedia of Philosophy, accessed 23 March 2016
- Hervada, Introduction, pg. 34 (citing Summa Theologiæ Ia-IIæ q.95 a.3)
- Finnis, John. Aquinas: Moral, Political, and Legal Theory (New York: Oxford University Press, 1998).
- Hervada, Javier. Introduction to the Study of Canon Law (Montréal: Wilson & Lafleur Ltée, 2007).
- Waldron, Jeremy (New York University School of Law), Torture, Suicide, and Determinatio; American Journal of Jurisprudence, Vol. 55, 2010; NYU School of Law, Public Law Research Paper No. 10-86.