The Collaborative International Dictionary of English v.0.48:

Preeminently \Pre*["e]m"i*nent*ly\, adv.
   In a pre["e]minent degree.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pre-eminently
    adv 1: to a preeminent degree; with superiority or distinction
           above others; in a preeminent manner; "a wide variety of
           pre-eminently contemporary scenes" [syn: pre-eminently,
           preeminently]