\E`qui*pol"lence\, Equipollency \E`qui*pol"len*cy\,
n. [Cf. F. ['e]quipollence. See {Equipollent}.]
1. Equality of power, force, signification, or application.
   --Boyle.

2. (Logic) Sameness of signification of two or more
   propositions which differ in language.