The Collaborative International Dictionary of English v.0.48:

Precise \Pre*cise"\, a. [L. praecisus cut off, brief, concise,
   p. p. of praecidere to cut off in front, to cut off; prae
   before + caedere to cut: cf. F. pr['e]cis. Cf. Concise.]
   1. Having determinate limitations; exactly or sharply defined
      or stated; definite; exact; nice; not vague or equivocal;
      as, precise rules of morality.
      [1913 Webster]

            The law in this point is not precise. --Bacon.
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            For the hour precise
            Exacts our parting hence.             --Milton.
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   2. Strictly adhering or conforming to rule; very nice or
      exact; punctilious in conduct or ceremony; formal;
      ceremonious. --Addison.
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            He was ever precise in promise-keeping. --Shak.
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   Syn: Accurate; exact; definite; correct; scrupulous;
        punctilious; particular; nice; formal. See Accurate.
        [1913 Webster] -- Pre*cise"ly, adv. --
        Pre*cise"ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

precisely
    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: in a precise manner; "she always expressed herself precisely"
       [syn: precisely, incisively, exactly] [ant:
       imprecisely, inexactly]
    3: just as it should be; "`Precisely, my lord,' he said" [syn:
       precisely, exactly, on the nose, on the dot, on the
       button]

Moby Thesaurus II by Grady Ward, 1.0:

145 Moby Thesaurus words for "precisely":
   OK, Roger, absolutely, accurately, all right, alright, alrighty,
   amen, as well, as you say, assuredly, at the gun, aye, bang,
   by all means, carefully, certainly, concretely, conscientiously,
   correctly, da, dead, definitely, directly, distinctly, especially,
   even, exactingly, exactly, expressly, exquisitely, faithfully,
   fine, flush, full, fussily, good, good enough, hear,
   in all respects, in detail, in every respect, in particular,
   in such wise, indeed, indeedy, inflexibly, ipsissimis verbis,
   item by item, ja, just, just like that, just so, kerplunk, like so,
   like that, like this, literally, literatim, mais oui, meticulously,
   minutely, most assuredly, naturally, naturellement, nicely,
   of course, okay, on the button, on the dot, on the instant,
   on the minute, on the nail, on the nose, on time, oui,
   particularly, plop, plumb, plump, plunk, point-blank, positively,
   punctiliously, punctually, quite, rather, really, refinedly, right,
   righto, rigidly, rigorously, scrupulously, separately, sharp,
   similarly, singly, slap, smack, smack-dab, so, spang, specially,
   specifically, square, squarely, straight, strictly, sure,
   sure thing, surely, this way, this-a-way, thus, thus and so,
   thus and thus, thusly, thuswise, to be specific, to be sure,
   to the letter, to the minute, truly, undeviatingly, unerringly,
   verbally, verbatim, verbatim et litteratim, very well,
   well and good, 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