# Haecceity |  | **Haecceity** is a term from medieval scholastic philosophy, first coined by followers of Duns Scotus to denote a concept that he seems to have originated: the irreducible determination of a thing that makes it this particular thing. Haecceity is a person's or object's thisness, the individualising difference between the concept "a man" and the concept "Socrates". In modern philosophy of physics, it is sometimes referred to as primitive thisness. | |-|-| | | wikipedia:: [Haecceity](https://en.wikipedia.org/wiki/Haecceity) | "thisness" [[Facticity]] [[Atomism]] [[Democritus]]