The Collaborative International Dictionary of English v.0.48:

Accurate \Ac"cu*rate\, a. [L. accuratus, p. p. and a., fr.
   accurare to take care of; ad + curare to take care, cura
   care. See Cure.]
   1. In exact or careful conformity to truth, or to some
      standard of requirement, the result of care or pains; free
      from failure, error, or defect; exact; as, an accurate
      calculator; an accurate measure; accurate expression,
      knowledge, etc.
      [1913 Webster]

   2. Precisely fixed; executed with care; careful. [Obs.]
      [1913 Webster]

            Those conceive the celestial bodies have more
            accurate influences upon these things below.
                                                  --Bacon.
      [1913 Webster]

   Syn: Correct; exact; just; nice; particular.

   Usage: Accurate, Correct, Exact, Precise. We speak of
          a thing as correct with reference to some rule or
          standard of comparison; as, a correct account, a
          correct likeness, a man of correct deportment. We
          speak of a thing as accurate with reference to the
          care bestowed upon its execution, and the increased
          correctness to be expected therefrom; as, an accurate
          statement, an accurate detail of particulars. We speak
          of a thing as exact with reference to that perfected
          state of a thing in which there is no defect and no
          redundance; as, an exact coincidence, the exact truth,
          an exact likeness. We speak of a thing as precise when
          we think of it as strictly conformed to some rule or
          model, as if cut down thereto; as a precise conformity
          instructions; precisely right; he was very precise in
          giving his directions.
          [1913 Webster]

WordNet (r) 3.0 (2006):

accurate
    adj 1: conforming exactly or almost exactly to fact or to a
           standard or performing with total accuracy; "an accurate
           reproduction"; "the accounting was accurate"; "accurate
           measurements"; "an accurate scale" [ant: inaccurate]
    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:

67 Moby Thesaurus words for "accurate":
   OK, absolute, all right, appreciative, attentive, authentic,
   careful, close, conscientious, correct, critical, dead right,
   delicate, demanding, dependable, detailed, differential,
   discriminate, discriminating, discriminative, distinctive,
   distinguishing, exact, exacting, exigent, exquisite, fastidious,
   faultless, fine, finical, finicking, finicky, flawless, fussy,
   just, just right, letter-perfect, meticulous, minute, narrow, nice,
   okay, on the mark, particular, perfect, precise, precisianistic,
   precisionistic, proper, punctilious, punctual, refined, reliable,
   religious, right, rigid, rigorous, scrupulous, scrutinizing,
   selective, sensitive, straight, straight-up-and-down, strict,
   subtle, tactful, unerring