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.
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WordNet (r) 3.0 (2006):

precise
    adj 1: sharply exact or accurate or delimited; "a precise mind";
           "specified a precise amount"; "arrived at the precise
           moment" [ant: imprecise]
    2: (of ideas, images, representations, expressions)
       characterized by perfect conformity to fact or truth ;
       strictly correct; "a precise image"; "a precise measurement"
       [syn: accurate, exact, precise]

Moby Thesaurus II by Grady Ward, 1.0:

150 Moby Thesaurus words for "precise":
   absolute, accurate, appreciative, attentive, authentic, be precise,
   careful, censorious, certain, choicy, choosy, circumscribed, close,
   concrete, conscientious, constant, correct, critical, defined,
   definite, delicate, demanding, descend to particulars, detail,
   detailed, determinate, different, differential, direct,
   discriminate, discriminating, discriminative, distinct,
   distinctive, distinguished, distinguishing, esoteric, especial,
   even, exact, exacting, exceptional, exigent, explicit, express,
   exquisite, extraordinary, faithful, fastidious, fine, finical,
   finicking, finicky, fixed, full, fussy, genteel, individual,
   individualize, inerrable, inerrant, infallible, inflexible, inner,
   intimate, itemize, limited, literal, literatim, make precise,
   mathematical, methodical, meticulous, micrometrically precise,
   microscopic, minute, narrow, nice, noteworthy, orderly, particular,
   particularize, peculiarize, perfect, perfectionistic, personal,
   personalize, picayune, picky, pinpoint, precious, precisian,
   precisianistic, precisionist, precisionistic, prig, priggish, prim,
   prissy, private, proper, prudish, punctilious, punctual, puristic,
   puritanic, puritanical, refined, religious, religiously exact,
   respective, restricted, right, rigid, rigorous, scientific,
   scientifically exact, scrupulous, scrutinizing, selective,
   sensitive, several, severe, singular, solipsistic, special,
   specialize, specific, spell out, square, straitlaced, strict,
   stringent, stuffy, subtle, tactful, true, truthful, unambiguous,
   unbending, unconditional, undeviating, unequivocal, unerring,
   unyielding, veracious, verbatim, very, well-defined,
   word-for-word