Full Idea
There cannot possibly be one definition of two things, or two definitions of the same thing.
Gist of Idea
There can't be one definition of two things, or two definitions of the same thing
Source
Aristotle (Topics [c.331 BCE], 154a11)
Book Reference
Aristotle: 'Posterior Analytics and Topica', ed/tr. Tredennick,H/Forster,ES [Harvard 1960], p.665
A Reaction
The second half of this is much bolder and more controversial, and plenty of modern thinkers would flatly reject it. Are definitions contextual, that is, designed for some specific human purpose. Must definitions be of causes?