CONGRUITY

, in Geometry, is applied to lines and figures, which exactly correspond when laid over one another; as having the same terms, or bounds. It is assumed, as an axiom, that those things are equal and similar, between which there is a congruity. Euclid, and most geometricians after him, demonstrate great part of their elements from the principle of congruity: though Leibnitz and Wolfius substitute the notion of Similitude instead of that of congruity.