Source : Webster's Revised Unabridged Dictionary (1913)

Counterpoise \Coun"ter*poise`\ (koun"t?r-poiz`; 277), v. t.
   [imp. & p. p. {Counterpoised} (-poizd`); p. pr. & vb. n.
   {Counterpoising}.] [OE. countrepesen, counterpeisen, F.
   contrepeser. See {Counter}, adv., and {Poise}, v. t. ]
   1. To act against with equal weight; to equal in weight; to
      balance the weight of; to counterbalance.

            Weights, counterpoising one another.  --Sir K.
                                                  Digby.

   2. To act against with equal power; to balance.

            So many freeholders of English will be able to beard
            and counterpoise the rest.            --Spenser.

Source : WordNet®

counterpoised
     adj : brought into equipoise by means of a weight or force that
           offsets another [syn: {counterbalanced}]