/ ˈɒbvɜːs; NAmE ˈɑːbvɜːrs/ noun (usually the obverse ) [ sing. ]
1.
( formal ) the opposite of sth :
The obverse of love is hate.
2.
( technical ) the side of a coin or medal that has the head or main design on it
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WORD ORIGIN
mid 17th cent. (in the sense turned towards the observer ): from Latin obversus , past participle of obvertere turn towards, from ob- towards + vertere to turn.