The Collaborative International Dictionary of English v.0.48:

Trespass \Tres"pass\, v. i. [imp. & p. p. Trespassed; p. pr. &
   vb. n. Trespassing.] [OF. trespasser to go across or
   over, transgress, F. tr['e]passer to die; pref. tres- (L.
   trans across, over) + passer to pass. See Pass, v. i., and
   cf. Transpass.]
   1. To pass beyond a limit or boundary; hence, to depart; to
      go. [Obs.]
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            Soon after this, noble Robert de Bruce . . .
            trespassed out of this uncertain world. --Ld.
                                                  Berners.
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   2. (Law) To commit a trespass; esp., to enter unlawfully upon
      the land of another.
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   3. To go too far; to put any one to inconvenience by demand
      or importunity; to intrude; as, to trespass upon the time
      or patience of another.
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   4. To commit any offense, or to do any act that injures or
      annoys another; to violate any rule of rectitude, to the
      injury of another; hence, in a moral sense, to transgress
      voluntarily any divine law or command; to violate any
      known rule of duty; to sin; -- often followed by against.
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            In the time of his distress did he trespass yet more
            against the Lord.                     --2 Chron.
                                                  xxviii. 22.
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The Collaborative International Dictionary of English v.0.48:

Trespass \Tres"pass\, n. [OF. trespas, F. tr['e]pas death. See
   Trespass, v.]
   1. Any injury or offence done to another.
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            I you forgive all wholly this trespass. --Chaucer.
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            If ye forgive not men their trespasses, neither will
            your Father forgive your trespasses.  --Matt. vi.
                                                  15.
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   2. Any voluntary transgression of the moral law; any
      violation of a known rule of duty; sin.
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            The fatal trespass done by Eve.       --Milton.
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            You . . . who were dead in trespasses and sins.
                                                  --Eph. if. 1.
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   3. (Law)
      (a) An unlawful act committed with force and violence (vi
          et armis) on the person, property, or relative rights
          of another.
      (b) An action for injuries accompanied with force.
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   Trespass offering (Jewish Antiq.), an offering in expiation
      of a trespass.

   Trespass on the case. (Law) See Action on the case, under
      Case.
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   Syn: Offense; breach; infringement; transgression;
        misdemeanor; misdeed.
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WordNet (r) 3.0 (2006):

trespass
    n 1: a wrongful interference with the possession of property
         (personal property as well as realty), or the action
         instituted to recover damages
    2: entry to another's property without right or permission [syn:
       trespass, encroachment, violation, intrusion,
       usurpation]
    v 1: enter unlawfully on someone's property; "Don't trespass on
         my land!" [syn: trespass, intrude]
    2: make excessive use of; "You are taking advantage of my good
       will!"; "She is trespassing upon my privacy" [syn:
       trespass, take advantage]
    3: break the law
    4: commit a sin; violate a law of God or a moral law [syn:
       sin, transgress, trespass]
    5: pass beyond (limits or boundaries) [syn: transgress,
       trespass, overstep]