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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 obversion
 將表面反過來,換置法

From: Webster's Revised Unabridged Dictionary (1913)

 Ob·ver·sion n.
 1. The act of turning toward or downward.
 2. Logic The act of immediate inference, by which we deny the opposite of anything which has been affirmed; as, all men are mortal; then, by obversion, no men are immortal.  This is also described as “immediate inference by privative conception.”
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