Bible Dictionaries
Obversion

Webster's Dictionary

(1):

(n.) The act of turning toward or downward.

(2):

(n.) 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."

Bibliography Information
Webster, Noah. Entry for 'Obversion'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​o/obversion.html. 1828.