The Collaborative International Dictionary of English v.0.48:

Re-ally \Re"-al*ly"\ (-l[imac]"), v. t. [Pref. re- + ally, v.
   t.]
   To bring together again; to compose or form anew. --Spenser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Really \Re"al*ly`\ (r[=a]"[aum]l*l[=e]`), adv.
   Royally. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Really \Re"al*ly\ (r[=e]"al*l[y^]), adv.
   In a real manner; with or in reality; actually; in truth.
   [1913 Webster]

         Whose anger is really but a short fit of madness.
                                                  --Swift.
   [1913 Webster]

   Note: Really is often used familiarly as a slight
         corroboration of an opinion or a declaration.
         [1913 Webster]

               Why, really, sixty-five is somewhat old. --Young.
         [1913 Webster]

WordNet (r) 3.0 (2006):

really
    adv 1: in accordance with truth or fact or reality; "she was now
           truly American"; "a genuinely open society"; "they don't
           really listen to us" [syn: truly, genuinely,
           really]
    2: in actual fact; "to be nominally but not actually
       independent"; "no one actually saw the shark"; "large
       meteorites actually come from the asteroid belt" [syn:
       actually, really]
    3: in fact (used as intensifiers or sentence modifiers); "in
       truth, moral decay hastened the decline of the Roman Empire";
       "really, you shouldn't have done it"; "a truly awful book"
       [syn: in truth, really, truly]
    4: used as intensifiers; `real' is sometimes used informally for
       `really'; `rattling' is informal; "she was very gifted"; "he
       played very well"; "a really enjoyable evening"; "I'm real
       sorry about it"; "a rattling good yarn" [syn: very,
       really, real, rattling]

Moby Thesaurus II by Grady Ward, 1.0:

123 Moby Thesaurus words for "really":
   OK, Roger, absolutely, actually, all right, almighty, alright,
   alrighty, amen, as you say, assuredly, at bottom, authentically,
   awfully, aye, by all means, categorically, certainly, clearly, da,
   de facto, decidedly, definitely, demonstrably, doubtlessly, easily,
   exactly, exceedingly, exceptionally, extraordinarily, extremely,
   factually, fine, for a certainty, for real, forsooth, genuinely,
   good, good enough, hear, historically, honestly, in actuality,
   in all conscience, in effect, in fact, in reality, in truth,
   in very sooth, indeed, indeedy, indubitably, ja, just, just so,
   legitimately, mais oui, manifestly, mightily, mighty,
   most assuredly, naturally, naturellement, nothing else but,
   noticeably, observably, obviously, of a truth, of course, okay,
   only too, oui, patently, positively, powerful, powerfully,
   precisely, pretty, quite, rather, real, really-truly, remarkably,
   right, righto, sensibly, seriously, so, sure, sure thing, surely,
   terribly, terrifically, to be sure, truly, unaffectedly,
   unambiguously, unassumedly, uncommonly, undeniably, undoubtedly,
   unmistakably, unquestionably, unusually, veridically, verily,
   veritably, very, very well, visibly, warts and all, well and good,
   why yes, with truth, without doubt, yea, yeah, yep, yes,
   yes indeed, yes indeedy, yes sir, yes sirree



The Devil's Dictionary (1881-1906):

REALLY, adv.  Apparently.