Source : Webster's Revised Unabridged Dictionary (1913)

Preponderate \Pre*pon"der*ate\, v. t. [imp. & p. p.
   {Preponderated}; p. pr. & vb. n. {Preponderating}.] [L.
   praeponderatus, p. p. of praeponderare; prae before +
   ponderare to weigh, fr., pondus, ponderis, a weight. See
   {Ponder}.]
   1. To outweigh; to overpower by weight; to exceed in weight;
      to overbalance.

            An inconsiderable weight, by distance from the
            center of the balance, will preponderate greater
            magnitudes.                           --Glanvill.

   2. To overpower by stronger or moral power.

   3. To cause to prefer; to incline; to decide. [Obs.]

            The desire to spare Christian blood preponderates
            him for peace.                        --Fuller.

Source : WordNet®

preponderating
     adj : having superior power and influence; "the predominant mood
           among policy-makers is optimism" [syn: {overriding}, {paramount},
            {predominant}, {predominate}, {preponderant}]