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obversion
noun
(3)
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obversion
[ ob-
vur
-zh
uh
n, -sh
uh
n ]
Phonetic (Standard)
IPA
noun
an act or instance of
obverting
.
something that is
obverted
.
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.”
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Word History and Origins
Origin of
obversion
1
1840–50; <
Late Latin
obversiōn-
(stem of
obversiō
) a turning toward, equivalent to
obvers
(
us
) (
obverse
) +
-iōn-
-ion
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