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obversion

[ ob-vur-zhuhn, -shuhn ]
/ ɒbˈvɜr ʒən, -ʃən /
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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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SHALL WE PLAY A "SHALL" VS. "SHOULD" CHALLENGE?
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Question 1 of 6
Which form is used to state an obligation or duty someone has?

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use obversion in a sentence

  • Dr. Bain calls this Material Obversion because it cannot be practised safely without reference to the matter of the proposition.

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

    Logic|Carveth Read
  • Define Obversion and Inversion, and apply these processes also to the above three propositions.

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

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