Source : Webster's Revised Unabridged Dictionary (1913)

Preponderance \Pre*pon"der*ance\, Preponderancy
\Pre*pon"der*an*cy\, n. [Cf. F. pr['e]pond['e]rance.]
   1. The quality or state of being preponderant; superiority or
      excess of weight, influence, or power, etc.; an
      outweighing.

            The mind should . . . reject or receive
            proportionably to the preponderancy of the greater
            grounds of probability.               --Locke.

            In a few weeks he had changed the relative position
            of all the states in Europe, and had restored the
            equilibrium which the preponderance of one power had
            destroyed.                            --Macaulay.

   2. (Gun.) The excess of weight of that part of a canon behind
      the trunnions over that in front of them.

Source : WordNet®

preponderance
     n 1: superiority in power or influence; "the preponderance of
          good over evil"; "the preponderance of wealth and power"
     2: a superiority in numbers or amount; "there is a
        preponderance of Blacks in our prisons" [syn: {prevalence}]
     3: exceeding in heaviness; having greater weight; "the least
        preponderance in either pan will unbalance the scale"