The Collaborative International Dictionary of English v.0.48:

Prove \Prove\, v. t. [imp. & p. p. Proved; p. pr. & vb. n.
   Proving.] [OE. prover, F. prouver, fr. L. probare to try,
   approve, prove, fr. probus good, proper. Cf. Probable,
   Proof, Probe.]
   1. To try or to ascertain by an experiment, or by a test or
      standard; to test; as, to prove the strength of gunpowder
      or of ordnance; to prove the contents of a vessel by a
      standard measure.
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            Thou hast proved mine heart.          --Ps. xvii. 3.
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   2. To evince, establish, or ascertain, as truth, reality, or
      fact, by argument, testimony, or other evidence.
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            They have inferred much from slender premises, and
            conjectured when they could not prove. --J. H.
                                                  Newman.
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   3. To ascertain or establish the genuineness or validity of;
      to verify; as, to prove a will.
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   4. To gain experience of the good or evil of; to know by
      trial; to experience; to suffer.
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            Where she, captived long, great woes did prove.
                                                  --Spenser.
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   5. (Arith.) To test, evince, ascertain, or verify, as the
      correctness of any operation or result; thus, in
      subtraction, if the difference between two numbers, added
      to the lesser number, makes a sum equal to the greater,
      the correctness of the subtraction is proved.
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   6. (Printing) To take a trial impression of; to take a proof
      of; as, to prove a page.
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   Syn: To try; verify; justify; confirm; establish; evince;
        manifest; show; demonstrate.
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WordNet (r) 3.0 (2006):

proved
    adj 1: established beyond doubt; "a proven liar"; "a Soviet
           leader of proven shrewdness" [syn: proved, proven]
           [ant: unproved, unproven]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "proved":
   actual, ascertained, assured, attested, authenticated, borne out,
   categorically true, certain, certified, circumstantiated,
   confirmed, corroborated, decided, demonstrated, determinate,
   determined, documentary, effectual, established, factual, fixed,
   guaranteed, historical, in the bag, made sure, nailed down,
   not in error, objectively true, on ice, open-and-shut, proven,
   real, secure, set, settled, shown, stated, substantiated,
   sure-enough, tested, tried, tried and true, true, true as gospel,
   truthful, unconfuted, undenied, undoubted, unerroneous,
   unfallacious, unfalse, unmistaken, unquestionable, unrefuted,
   validated, veracious, verified, veritable, warranted