In the proposition, 'Of' was used more indefinitely three hundred years ago than it is now, 'of' is categorematic.
A nice point is whether the Adjective is categorematic or syncategorematic.
A word that can stand by itself as a term is said to be categorematic.
A mixed term is, in the only useful sense of the word, categorematic.
Thus words are classified as categorematic or Syncategorematic.
In common speech an adjective may stand by itself as a predicate, and so might be said to be categorematic.