Source : Webster's Revised Unabridged Dictionary (1913)

Equiponderate \E`qui*pon"der*ate\, v. i. [Equi- + L. ponderare
   to weigh. See {Ponderate}.]
   To be equal in weight; to weigh as much as another thing.
   --Bp. Wilkins.

Equiponderate \E`qui*pon"der*ate\, v. t.
   To make equal in weight; to counterbalance. ``More than
   equiponderated the declension in that direction.'' --De
   Quincey.