What is the meaning of Counterpoise?

A weight sufficient to balance another, for example in the opposite end of scales; an equal weight.

An effect of equal power or force acting in opposition; a force sufficient to balance another force or influence

The relation of two weights or forces which balance each other; equilibrium

To act against with equal weight; to equal in weight; to balance the weight of; to counterbalance.

To act against with equal power; to balance.

Source: wiktionary.org