Definitions for "Obversion"
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."
A process of eduction in which the inferred judgment, while retaining the original subject, has for its predicate the contradictory of the original predicate. Synonym: Equipollence.
is the replacement of one form by another in which the quality of the first is changed and the predicate replaced by its contradictory or complement; by this the term No is defined by the term All. ( Study 2)
Keywords:  downward, turning, act
The act of turning toward or downward.