World English Dictionary
obverse (ˈɒbvɜːs)
1.  facing or turned towards the observer
2.  forming or serving as a counterpart
3.  (of certain plant leaves) narrower at the base than at the top
4.  a counterpart or complement
5.  Compare reverse the side of a coin that bears the main design or device
6.  logic a categorial proposition derived from another by replacing the original predicate by its negation and changing the proposition from affirmative to negative or vice versa, as no sum is correct from every sum is incorrect
[C17: from Latin obversus turned towards, past participle of obvertere, from ob- to + vertere to turn]

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