Obversion
Pronunciation : Ob*ver"sion
Part of Speech : n.
Etymology : [L. obversio a turning towards.]
Definition : 1. The act of turning toward or downward.
2. (Logic)
Defn: The act of immediate inference, by which we deny the opposite of anything which has been affirmed; as, all men are mortal; then, by obversion, no men are immortal. This is also described as "immediate inference by privative conception." Bain.
Source : Webster's Unabridged Dictionary, 1913