The Collaborative International Dictionary of English v.0.48:

Truth \Truth\, v. t.
   To assert as true; to declare. [R.]
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         Had they [the ancients] dreamt this, they would have
         truthed it heaven.                       --Ford.
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The Collaborative International Dictionary of English v.0.48:

Truth \Truth\, n.; pl. Truths. [OE. treuthe, trouthe, treowpe,
   AS. tre['o]w?. See True; cf. Troth, Betroth.]
   1. The quality or being true; as:
      (a) Conformity to fact or reality; exact accordance with
          that which is, or has been; or shall be.
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      (b) Conformity to rule; exactness; close correspondence
          with an example, mood, object of imitation, or the
          like.
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                Plows, to go true, depend much on the truth of
                the ironwork.                     --Mortimer.
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      (c) Fidelity; constancy; steadfastness; faithfulness.
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                Alas! they had been friends in youth,
                But whispering tongues can poison truth.
                                                  --Coleridge.
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      (d) The practice of speaking what is true; freedom from
          falsehood; veracity.
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                If this will not suffice, it must appear
                That malice bears down truth.     --Shak.
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   2. That which is true or certain concerning any matter or
      subject, or generally on all subjects; real state of
      things; fact; verity; reality.
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            Speak ye every man the truth to his neighbor.
                                                  --Zech. viii.
                                                  16.
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            I long to know the truth here of at large. --Shak.
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            The truth depends on, or is only arrived at by, a
            legitimate deduction from all the facts which are
            truly material.                       --Coleridge.
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   3. A true thing; a verified fact; a true statement or
      proposition; an established principle, fixed law, or the
      like; as, the great truths of morals.
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            Even so our boasting . . . is found a truth. --2
                                                  Cor. vii. 14.
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   4. Righteousness; true religion.
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            Grace and truth came by Jesus Christ. --John i. 17.
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            Sanctify them through thy truth; thy word is truth.
                                                  --John xvii.
                                                  17.
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   In truth, in reality; in fact.

   Of a truth, in reality; certainly.

   To do truth, to practice what God commands.
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            He that doeth truth cometh to the light. --John iii.
                                                  21.
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WordNet (r) 3.0 (2006):

truth
    n 1: a fact that has been verified; "at last he knew the truth";
         "the truth is that he didn't want to do it"
    2: conformity to reality or actuality; "they debated the truth
       of the proposition"; "the situation brought home to us the
       blunt truth of the military threat"; "he was famous for the
       truth of his portraits"; "he turned to religion in his search
       for eternal verities" [syn: truth, the true, verity,
       trueness] [ant: falseness, falsity]
    3: a true statement; "he told the truth"; "he thought of
       answering with the truth but he knew they wouldn't believe
       it" [syn: truth, true statement] [ant: falsehood,
       falsity, untruth]
    4: the quality of being near to the true value; "he was
       beginning to doubt the accuracy of his compass"; "the lawyer
       questioned the truth of my account" [syn: accuracy,
       truth] [ant: inaccuracy]
    5: United States abolitionist and feminist who was freed from
       slavery and became a leading advocate of the abolition of
       slavery and for the rights of women (1797-1883) [syn:
       Truth, Sojourner Truth]

The Devil's Dictionary (1881-1906):

TRUTH, n.  An ingenious compound of desirability and appearance.
Discovery of truth is the sole purpose of philosophy, which is the
most ancient occupation of the human mind and has a fair prospect of
existing with increasing activity to the end of time.