(redirected from Obversion (logic))
Also found in: Encyclopedia.


 (ŏb-vûr′zhən, əb-)
1. The process of obverting or the condition so resulting.
2. Logic Inference of the obverse of a proposition.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ɒbˈvɜr ʒən, -ʃən)

1. an act or instance of obverting.
2. 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.”
[1840–50; < Late Latin]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.