preponderantly

from WordNet (r) 3.0 (2006)

preponderantly
    adv 1: much greater in number or influence; "the patients are
           predominantly indigenous" [syn: {predominantly},
           {preponderantly}]

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]