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From The Collaborative International Dictionary of English v.0.48:
Obversion \Ob*ver"sion\ ([o^]b*v[~e]r"sh[u^]n), n. [L. obversio a turning towards.] 1. The act of turning toward or downward. [1913 Webster] 2. (Logic) 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. [1913 Webster]