The Collaborative International Dictionary of English v.0.48:

Exactly \Ex*act"ly\, adv.
   In an exact manner; precisely according to a rule, standard,
   or fact; accurately; strictly; correctly; nicely. "Exactly
   wrought." --Shak.
   [1913 Webster]

         His enemies were pleased, for he had acted exactly as
         their interests required.                --Bancroft.
   [1913 Webster]

WordNet (r) 3.0 (2006):

exactly
    adv 1: indicating exactness or preciseness; "he was doing
           precisely (or exactly) what she had told him to do"; "it
           was just as he said--the jewel was gone"; "it has just
           enough salt" [syn: precisely, exactly, just]
    2: just as it should be; "`Precisely, my lord,' he said" [syn:
       precisely, exactly, on the nose, on the dot, on the
       button]
    3: in a precise manner; "she always expressed herself precisely"
       [syn: precisely, incisively, exactly] [ant:
       imprecisely, inexactly]

Moby Thesaurus II by Grady Ward, 1.0:

142 Moby Thesaurus words for "exactly":
   OK, Roger, absolutely, accurately, all, all in all, all right,
   alright, alrighty, altogether, amen, as well, as you say,
   assuredly, at the gun, aye, bang, by all means, certainly, closely,
   completely, concretely, conscientiously, correctly, da, dead,
   definitely, directly, distinctly, especially, even, exactingly,
   explicitly, expressly, exquisitely, faithfully, faultlessly, fine,
   flush, full, fussily, good, good enough, hear, in all respects,
   in detail, in every respect, in particular, in toto, indeed,
   indeedy, ipsissimis verbis, item by item, ja, just, just so,
   kerplunk, literally, literatim, mais oui, methodically,
   meticulously, minutely, most assuredly, naturally, naturellement,
   nicely, of course, okay, on the dot, on the instant, on the minute,
   on time, oui, particularly, perfectly, plop, plumb, plump, plunk,
   point-blank, positively, precisely, punctiliously, punctually,
   quite, rather, really, refinedly, right, righto, rigidly,
   rigorously, scrupulously, separately, sharp, singly, smack,
   smack-dab, spang, specially, specifically, square, squarely, stick,
   straight, strictly, sure, sure thing, surely, systematically,
   to be specific, to be sure, to the letter, to the minute, totally,
   truly, undeniably, undeviatingly, unequivocally, unerringly,
   utterly, verbally, verbatim, verbatim et litteratim, very well,
   well and good, wholly, why yes, with exactitude, with great nicety,
   with precision, word by word, word for word, yea, yeah, yep, yes,
   yes indeed, yes indeedy, yes sir, yes sirree