The Collaborative International Dictionary of English v.0.48:

Notably \Not"a*bly\, adv.
   In a notable manner.
   [1913 Webster]

WordNet (r) 3.0 (2006):

notably
    adv 1: especially; in particular; "notably in the social
           sciences, the professors teach too much"

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "notably":
   abundantly, acutely, amazingly, amply, arrantly, astonishingly,
   awesomely, blatantly, boldly, celebratedly, clearly,
   consequentially, conspicuously, copiously, curiously, distinctly,
   eminently, emphatically, especially, evidently, exceptionally,
   exquisitely, extraordinarily, exuberantly, famously, flagrantly,
   generously, glaringly, gloriously, grandly, greatly, importantly,
   impressively, incredibly, intensely, magically, magnanimously,
   magnificently, manifestly, markedly, marvelously, materially,
   meaningfully, momentously, nobly, notedly, noticeably, notoriously,
   obtrusively, obviously, ostensibly, outstandingly, particularly,
   peculiarly, pointedly, popularly, preeminently, profusely,
   prominently, pronouncedly, remarkably, richly, saliently,
   shockingly, signally, significantly, singularly, specifically,
   splendidly, staringly, strangely, strikingly, stunningly,
   superlatively, surpassingly, surprisingly, uncommonly, uniquely,
   unusually, wonderfully, wondrous, worthily