[n. ob-vurs; adj. ob-vurs, ob-vurs]
the side of a coin, medal, flag, etc., that bears the principal design (opposed to reverse ).
the front or principal surface of anything.
a counterpart.
Logic. a proposition obtained from another by obversion.
facing the observer.
corresponding to something else as a counterpart.
having the base narrower than the top, as a leaf.

1650–60; < Latin obversus turned toward or against (past participle of obvertere), equivalent to ob- ob- + vert(ere) to turn + -tus past participle suffix, with tt > s

converse, inverse, obverse, reverse (see synonym study at reverse).
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1656 (adj.), from L. obversus, pp. of obvertere "to turn toward or against," from ob "toward" + vertere "to turn" (see versus). The noun, in ref. to coins, medals, etc. (opposite of reverse), is attested from 1658.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
At age eighty he can be observed in his obverse infancy, metaphorically sucking
  and tonguing the missing tooth of his life.
The easy praising of benevolence has no costless obverse in respect to
  controlling against harms inflicted on strangers.
The obverse of these desirable characteristics looks less appealing.
Then there is the obverse of the argument in the second paragraph.
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