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The Collaborative International Dictionary
Preponderancy

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.

Wiktionary
preponderancy

n. (archaic form of preponderance English)

Usage examples of "preponderancy".

Owing to this simple omission, the crane got a preponderancy to one side, and fell upon the building with a terrible crash.