Source : Webster's Revised Unabridged Dictionary (1913)

Preponderant \Pre*pon"der*ant\, a. [L. praeponderans, -antis:
   cf. F. pr['e]pond['e]rant. See {Preponderate}.]
   Preponderating; outweighing; overbalancing; -- used literally
   and figuratively; as, a preponderant weight; of preponderant
   importance. -- {Pre*pon"der*ant*ly}, adv.

Source : WordNet®

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