The quality or state of having equal power, force, or significance; logical equivalence between statements or arguments.
From Medieval Latin equipollentia, combining equipoll- (to be of equal strength, from equi- and pollere meaning to be strong) and -ence (state or condition). First used in logic to describe equivalent arguments.
In logic, two completely different-looking arguments can have equipollence—like saying 'all cats are mammals' and 'no mammals are non-cats' sound different but mean exactly the same thing!
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