Full Idea
According to Aristotle, the terms of a language form a finite hierarchy, where the higher terms are predicable of more things than are lower terms.
Gist of Idea
Linguistic terms form a hierarchy, with higher terms predicable of increasing numbers of things
Source
report of Aristotle (Prior Analytics [c.328 BCE]) by George Engelbretsen - Trees, Terms and Truth 3
Book Reference
'The Old New Logic', ed/tr. Oderberg,David S. [MIT 2005], p.35
A Reaction
I would be a bit cautious about placing something precisely in a hierarchy according to how many things it can be predicated of. It is a start, though, in trying to give a decent account of generality, which is a major concept in philosophy.