The Collaborative International Dictionary of English v.0.48:

True \True\ (tr[udd]), a. [Compar. Truer (tr[udd]"[~e]r);
   superl. Truest.] [OE. trewe, AS. tre['o]we faithful, true,
   from tre['o]w fidelity, faith, troth; akin to OFries. triuwe,
   adj., treuwa, n., OS. triuwi, adj., trewa, n., D. trouw, adj.
   & n., G. treu, adj., treue, n., OHG. gitriuwi, adj., triuwa,
   n., Icel. tryggr, adj., Dan. tro, adj. & n., Sw. trogen,
   adj., tro, n., Goth. triggws, adj., triggwa, n., trauan to
   trust, OPruss druwis faith. Cf. Trow, Trust, Truth.]
   [1913 Webster]
   1. Conformable to fact; in accordance with the actual state
      of things; correct; not false, erroneous, inaccurate, or
      the like; as, a true relation or narration; a true
      history; a declaration is true when it states the facts.
      [1913 Webster]

   2. Right to precision; conformable to a rule or pattern;
      exact; accurate; as, a true copy; a true likeness of the
      original.
      [1913 Webster]

            Making his eye, foot, and hand keep true time. --Sir
                                                  W. Scott.
      [1913 Webster]

   3. Steady in adhering to friends, to promises, to a prince,
      or the like; unwavering; faithful; loyal; not false,
      fickle, or perfidious; as, a true friend; a wife true to
      her husband; an officer true to his charge.
      [1913 Webster]

            Thy so true,
            So faithful, love unequaled.          --Milton.
      [1913 Webster]

            Dare to be true: nothing can need a lie. --Herbert.
      [1913 Webster]

   4. Actual; not counterfeit, adulterated, or pretended;
      genuine; pure; real; as, true balsam; true love of
      country; a true Christian.
      [1913 Webster]

            The true light which lighteth every man that cometh
            into the world.                       --John i. 9.
      [1913 Webster]

            True ease in writing comes from art, not chance.
                                                  --Pope.
      [1913 Webster]

   5. (Biol.) Genuine; real; not deviating from the essential
      characters of a class; as, a lizard is a true reptile; a
      whale is a true, but not a typical, mammal.
      [Webster 1913 Suppl.]

   Note: True is sometimes used elliptically for It is true.
         [1913 Webster]

   Out of true, varying from correct mechanical form,
      alignment, adjustment, etc.; -- said of a wall that is not
      perpendicular, of a wheel whose circumference is not in
      the same plane, and the like. [Colloq.]

   A true bill (Law), a bill of indictment which is returned
      by the grand jury so indorsed, signifying that the charges
      to be true.

   True time. See under Time.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

True \True\, adv.
   In accordance with truth; truly. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

true
    adv 1: as acknowledged; "true, she is the smartest in her class"
           [syn: true, admittedly, avowedly, confessedly]
    adj 1: consistent with fact or reality; not false; "the story is
           true"; "it is undesirable to believe a proposition when
           there is no ground whatever for supposing it true"- B.
           Russell; "the true meaning of the statement" [ant:
           false]
    2: accurately placed or thrown; "his aim was true"; "he was dead
       on target" [syn: true, dead on target]
    3: devoted (sometimes fanatically) to a cause or concept or
       truth; "true believers bonded together against all who
       disagreed with them"
    4: expressing or given to expressing the truth; "a true
       statement"; "gave truthful testimony"; "a truthful person"
       [syn: truthful, true] [ant: untruthful]
    5: conforming to definitive criteria; "the horseshoe crab is not
       a true crab"; "Pythagoras was the first true mathematician"
    6: worthy of being depended on; "a dependable worker"; "an
       honest working stiff"; "a reliable sourcSFLe of information";
       "he was true to his word"; "I would be true for there are
       those who trust me" [syn: dependable, honest, reliable,
       true(p)]
    7: not pretended; sincerely felt or expressed; "genuine
       emotion"; "her interest in people was unfeigned"; "true
       grief" [syn: genuine, true(a), unfeigned]
    8: rightly so called; "true courage"; "a spirit which true men
       have always admired"; "a true friend"
    9: determined with reference to the earth's axis rather than the
       magnetic poles; "true north is geographic north"
    10: having a legally established claim; "the legitimate heir";
        "the true and lawful king" [syn: true(a), lawful,
        rightful(a)]
    11: in tune; accurate in pitch; "a true note" [syn: on-key,
        true]
    12: accurately fitted; level; "the window frame isn't quite
        true" [syn: true, straight]
    n 1: proper alignment; the property possessed by something that
         is in correct or proper alignment; "out of true"
    v 1: make level, square, balanced, or concentric; "true up the
         cylinder of an engine" [syn: true, true up]