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obversion

[ob-vur-zhuh n, -shuh n] /ɒbˈvɜr ʒən, -ʃən/
noun
1.
an act or instance of obverting.
2.
something that is obverted.
3.
Logic. 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.”.
Origin of obversion
1840-1850
1840-50; < Late Latin obversiōn- (stem of obversiō) a turning toward, equivalent to obvers(us) (see obverse) + -iōn- -ion
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Based on the Random House Dictionary, © Random House, Inc. 2016.
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