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Obversion is a 9 letter word which starts with the letter O and ends with the letter N for which we found 2 definitions.

(n.) The act of turning toward or downward.
(n.) 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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