The Collaborative International Dictionary of English v.0.48:

Conclusive \Con*clu"sive\, a. [Cf. F. conclusif.]
   Belonging to a close or termination; decisive; convincing;
   putting an end to debate or question; leading to, or
   involving, a conclusion or decision.
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         Secret reasons . . . equally conclusive for us as they
         were for them.                           --Rogers.
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   Conclusive evidence (Law), that of which, from its nature,
      the law allows no contradiction or explanation.

   Conclusive presumption (Law), an inference which the law
      makes so peremptorily that it will not allow it to be
      overthrown by any contrary proof, however strong.

   Syn: Final; ultimate; unanswerable. See Final.
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The Collaborative International Dictionary of English v.0.48:

Evidence \Ev"i*dence\, n. [F. ['e]vidence, L. Evidentia. See
   Evident.]
   1. That which makes evident or manifest; that which
      furnishes, or tends to furnish, proof; any mode of proof;
      the ground of belief or judgement; as, the evidence of our
      senses; evidence of the truth or falsehood of a statement.
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            Faith is . . . the evidence of things not seen.
                                                  --Heb. xi. 1.
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            O glorious trial of exceeding love
            Illustrious evidence, example high.   --Milton.
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   2. One who bears witness. [R.] "Infamous and perjured
      evidences." --Sir W. Scott.
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   3. (Law) That which is legally submitted to competent
      tribunal, as a means of ascertaining the truth of any
      alleged matter of fact under investigation before it;
      means of making proof; -- the latter, strictly speaking,
      not being synonymous with evidence, but rather the effect
      of it. --Greenleaf.
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   Circumstantial evidence, Conclusive evidence, etc. See
      under Circumstantial, Conclusive, etc.

   Crown's evidence, King's evidence, or Queen's evidence,
      evidence for the crown, in English courts; equivalent to
      state's evidence in American courts. [Eng.]

   State's evidence, evidence for the government or the
      people. [U. S. ]

   To turn King's evidence To turn Queen's evidence, or To
   turn State's evidence, to confess a crime and give evidence
      against one's accomplices.

   Syn: Testimony; proof. See Testimony.
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