The Collaborative International Dictionary of English v.0.48:

Partially \Par"tial*ly\ adv.
   1. In part; not totally; as, partially true; the sun
      partially eclipsed. --Sir T. Browne.
      [1913 Webster]

   2. In a partial manner; with undue bias of mind; with unjust
      favor or dislike; as, to judge partially. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

partially
    adv 1: in part; in some degree; not wholly; "I felt partly to
           blame"; "He was partially paralyzed" [syn: partially,
           partly, part] [ant: all, altogether,
           completely, entirely, totally, whole, wholly]

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "partially":
   after a fashion, appreciably, at any rate, at best, at least,
   at most, at the least, at the most, at the outside, at worst,
   by halves, comparatively, defectively, deficiently, detectably,
   fairly, faultily, imperfectly, in a manner, in a way,
   in half measures, in installments, in part, in some measure,
   inadequately, incompletely, indefensibly, inexcusably, inexpiably,
   iniquitously, interestedly, irremissibly, leastwise, merely,
   mildly, moderately, modestly, not comprehensively,
   not exhaustively, one-sidedly, only, part, partly, pro tanto,
   purely, relatively, simply, so far, somewhat, thus far,
   to a degree, to some degree, to some extent, tolerably,
   unallowably, unconscionably, undeservedly, undispassionately,
   unequally, unevenly, unfairly, unforgivably, unjustifiably,
   unjustly, unpardonably, unreasonably, unwarrantably, visibly,
   wrongfully, wrongly