coun·ter·in·stance | \ ˌkau̇n-tər-ˈin(t)-stən(t)s 
\
\variants:
or counter-instance
plural counterinstances or counter-instances
Definition of counterinstance
: a case that contradicts a rule, theory, etc. : exception sense 2 But in science and philosophy, few things are more prized than a clear counter-instance to a putative law or a prospective definition.— Toni Vogel Carey
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Time Traveler for counterinstance
The first known use of counterinstance was in 1847
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