Full Idea
A 'categorial' property is a property something has by virtue of being or having an item from one of the categories.
Gist of Idea
A 'categorial' property is had by virtue of being or having an item from a category
Source
Michael V. Wedin (Aristotle's Theory of Substance [2000], V.5)
Book Reference
Wedin,Michael V.: 'Aristotle's Theory of Substance' [OUP 2000], p.194
A Reaction
I deny that these are 'properties'. A thing is categorised according to its properties. To denote the category as a further property is the route to madness (well, to a regress).