The Collaborative International Dictionary of English v.0.48:

Comparatively \Com*par"a*tive*ly\, adv.
   According to estimate made by comparison; relatively; not
   positively or absolutely.
   [1913 Webster]

         With but comparatively few exceptions.   --Prescott.
   [1913 Webster]

WordNet (r) 3.0 (2006):

comparatively
    adv 1: in a relative manner; by comparison to something else;
           "the situation is relatively calm now" [syn:
           relatively, comparatively]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "comparatively":
   after a fashion, appositely, appreciably, at any rate, at best,
   at least, at most, at the least, at the most, at the outside,
   at worst, comparably, detectably, fairly, germanely, in a manner,
   in a way, in part, in some measure, incompletely, leastwise,
   merely, mildly, moderately, modestly, not absolutely,
   not comprehensively, not exhaustively, only, part, partially,
   partly, pertinently, pro tanto, proportionately, purely,
   relatively, relevantly, simply, so far, somewhat, thus far,
   to a degree, to an extent, to some degree, tolerably, visibly