The other day we ran into the term suppositum. I looked it up on Google, and found this bit from the Catholic Dictionary’s entry for person:

Rationalis naturae — Person is predicated only of intellectual beings. The generic word which includes all individual existing substances is suppositum. Thus person is a subdivision of suppositum which is applied equally to rational and irrational, living and non-living individuals. A person is therefore sometimes defined as suppositum naturae rationalis.

Thus, a suppositum is an individual substance; a person is an individual substance, a suppositum with a rational nature.

Now you know.

One Response to “Suppositum”

  1. andrew says:

    Thanks, I was just reading Aquinas, and couldn’t find this on or on Wikipedia.