1
: the side of a coin or currency note bearing the chief device and lettering
broadly
: a front or principal surface
2
: a counterpart having the opposite orientation or force
Their rise was merely the obverse of the Empire's fall …—
A. J. Toynbee
3
: a proposition inferred immediately from another by denying the opposite of what the given proposition affirms
the obverse of "all A is B" is "no A is not B"
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Merriam-Webster unabridged



