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1. (n.) obversion
an act or instance of obverting.
2. obversion
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.”
Etymology: (1840–50; < LL)
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| Definition of 'obversion' |
Webster Dictionary |
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1. (noun) obversion
the act of turning toward or downward
2. (noun) 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."
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Definitions of obversion 
