The Collaborative International Dictionary of English v.0.48:

Absolutely \Ab"so*lute*ly\, adv.
   In an absolute, independent, or unconditional manner; wholly;
   positively.
   [1913 Webster]

WordNet (r) 3.0 (2006):

absolutely
    adv 1: completely and without qualification; used informally as
           intensifiers; "an absolutely magnificent painting"; "a
           perfectly idiotic idea"; "you're perfectly right";
           "utterly miserable"; "you can be dead sure of my
           innocence"; "was dead tired"; "dead right" [syn:
           absolutely, perfectly, utterly, dead]
    2: totally and definitely; without question; "we are absolutely
       opposed to the idea"; "he forced himself to lie absolutely
       still"; "iron is absolutely necessary"

Moby Thesaurus II by Grady Ward, 1.0:

165 Moby Thesaurus words for "absolutely":
   OK, Roger, a outrance, actually, affirmatively, all out, all right,
   alright, alrighty, altogether, amen, and no mistake, as you say,
   assertively, assuredly, at all events, at any rate, aye,
   beyond all bounds, beyond compare, beyond comparison,
   beyond measure, by all means, categorically, certainly, clean,
   clearly, completely, da, de facto, dead, decidedly, decisively,
   declaratively, definitely, directly, distinctly, doubtless,
   doubtlessly, downright, emphatically, entirely, essentially, even,
   exactly, expressly, extremely, faithfully, faultlessly, fine,
   flat out, flawlessly, for a certainty, for a fact, for certain,
   for sure, forsooth, fully, fundamentally, genuinely, good,
   good enough, hear, ideally, immaculately, immeasurably, impeccably,
   in actuality, in all respects, in effect, in every respect,
   in fact, in reality, in the extreme, in truth, incalculably,
   indeed, indeedy, indefinitely, indubitably, infallibly, infinitely,
   ipsissimis verbis, irretrievably, irrevocably, ja, just,
   just right, just so, literally, literatim, mais oui, manifestly,
   most, most assuredly, most certainly, naturally, naturellement,
   nothing else but, obviously, of course, okay, oui, perfectly,
   plain, plumb, point-blank, positively, precisely, predicatively,
   purely, quite, radically, rather, really, right, righto, rigidly,
   rigorously, sheer, spotlessly, square, squarely, stark, straight,
   strictly, sure, sure thing, surely, thoroughly, to a certainty,
   to be sure, to the letter, totally, truly, unconditionally,
   under oath, undeviatingly, unequivocally, unerringly, unmistakably,
   unquestionably, unrelievedly, unreservedly, utterly, verbally,
   verbatim, verbatim et litteratim, veritably, very well,
   well and good, wholly, why yes, with a vengeance, with emphasis,
   word by word, word for word, yea, yeah, yep, yes, yes indeed,
   yes indeedy, yes sir, yes sirree