obversion

[ ob-vur-zhuh n, -shuh n ]
/ ɒbˈvɜr ʒən, -ʃən /

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.”

Origin of obversion

1840–50; < Late Latin obversiōn- (stem of obversiō) a turning toward, equivalent to obvers(us) (see obverse) + -iōn- -ion

Words nearby obversion

obulg., obumbrant, obumbrate, obv, obverse, obversion, obvert, obviate, obvious, obviously, obvolute

Example sentences from the Web for obversion

  • A further process, known as Contraposition or Conversion by Negation, consists of conversion following on obversion.

    Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 |Various

  • In this it differs from Obversion, Conversion, and Contraposition, each of which stands for one process.

    Logic |Carveth Read