Ăp'a-gō'ge, n.

n. [Gr. ἀπαγωγή, a leading away, from ἀπάγειν, to lead away, from ἀπό, from, and ἄγειν, to lead, drive.]

1. (Logic.) An indirect argument which proves a thing by showing the impossibility or absurdity of the contrary thing. It corresponds to the reductio ad absurdum. Ernesti.
2. (Math.) A progress or passage from one proposition to another, when the first, having been demonstrated, is employed in proving others.