| 单词 | obversion |
| 释义 | obversion /ob verr"zheuhn, -sheuhn/, n. 1. an act or instance of obverting. 2. something that is obverted. 3. 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." [1840-50; < LL obversion- (s. of obversio) a turning toward, equiv. to obvers(us) (see OBVERSE) + -ion- -ION] |
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