Definition of counterpoising:
(n) :
An effect of equal power or force acting in opposition; a force sufficient to balance another force or influence
(v) :
To act against with equal power; to balance.
(n) :
The relation of two weights or forces which balance each other; equilibrium
(n) :
A weight sufficient to balance another, for example in the opposite end of scales; an equal weight.
(v) :
To act against with equal weight; to equal in weight; to balance the weight of; to counterbalance.