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]

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "preeminently":
   abundantly, acutely, amazingly, amply, astonishingly, awesomely,
   conspicuously, copiously, egregiously, eminently, emphatically,
   exceedingly, exceptionally, exquisitely, extraordinarily,
   exuberantly, famously, far and away, generously, glaringly,
   impressively, incomparably, incredibly, inimitably, intensely,
   magically, magnanimously, magnificently, markedly, marvelously,
   nobly, notably, par excellence, paramountly, particularly,
   peculiarly, pointedly, profusely, prominently, pronouncedly,
   remarkably, richly, signally, singularly, splendidly, strikingly,
   superlatively, supremely, surpassingly, surprisingly, the most,
   to crown all, transcendently, uncommonly, unusually, wonderfully,
   wondrous, worthily