obversion

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ob·ver·sion

 (ŏb-vûr′zhən, əb-)
n.
1. The process of obverting or the condition so resulting.
2. Logic Inference of the obverse of a proposition.

ob•ver•sion

(ɒbˈvɜr ʒən, -ʃən)

n.
1. an act or instance of obverting.
2. a form of inference in which a negative proposition is obtained from an affirmative, or vice versa, as “None of us is immortal” is obtained by obversion from “All of us are mortal.”
[1840–50; < Late Latin]