Definition of "obversion" [ob•ver•sion]

• The process of obverting or the condition so resulting. (noun)
• Logic Inference of the obverse of a proposition. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "It turns out that Strawson's revision of truth conditions does preserve the principles of SQUARE (these can easily be checked by cases), [27] but not the additional conversion principles of [SQUARE], and also not the traditional principles of contraposition or obversion."
• "These are the theory of the syllogism and the doctrines of contraposition and obversion."
• "A similar thing happened with the principle of obversion."