Counterbalance

Webster's Dictionary of the English Language

·noun A weight, power, or agency, acting against or balancing another.

II. Counterbalance ·noun A counterpoise to balance the weight of anything, as of a drawbridge or a scale beam.

III. Counterbalance ·noun A mass of metal in one side of a driving wheel or fly wheel, to balance the weight of a crank pin, ·etc., on the opposite side of the wheel.

IV. Counterbalance ·vt To oppose with an equal weight or power; to counteract the power or effect of; to Countervail; to Equiponderate; to Balance.