(from αὐτός and ἀπορεῖ), in Rhetoric, a definition of a thing contrary to that given by the adverse party. Thus, if the plaintiff urge, that to take anything away from another without his knowledge or consent, is a theft; this is called ἀπορεῖ, or definition. If the defendant reply, that to take a thing away from another without his knowledge or consent, but with the design to return it to him again, is not theft; this is an ἀπορεῖ.