To oppose with an equal weight or power; to counteract the power or effect of; to countervail; to balance.

1. To act against with equal weight; to equal in weght; to balance the weight of; to counterbalance.
2. To act against with equal power; to balance.

To act against with equal force, power, or effect; to thwart or overcome by such action; to furnish an equivalent to or for; to counterbalance; to compensate.