WordReference Random House Unabridged Dictionary of American English © 2025
ob•ver•sion
(ob vûr′zhən, -shən),USA pronunciation n.
- an act or instance of obverting.
- something that is obverted.
- Philosophy[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.''
- Late Latin obversiōn- (stem of obversiō) a turning toward, equivalent. to obvers(us) (see obverse) + -iōn- -ion
- 1840–50
'obversion' also found in these entries (note: many are not synonyms or translations):