Source : Webster's Revised Unabridged Dictionary (1913)

Transgression \Trans*gres"sion\, n. [L. transgressio a going
   across, going over, transgression of the law, from
   transgredi, transgressus, to step across, go over; trans
   over, across + gradi to step, walk: cf. F. transgression. See
   {Grade}.]
   The act of transgressing, or of passing over or beyond any
   law, civil or moral; the violation of a law or known
   principle of rectitude; breach of command; fault; offense;
   crime; sin.

         Forgive thy people . . . all their transgressions
         wherein they have transgressed against thee. --I Kings
                                                  viii. 50.

         What rests, but that the mortal sentence pass On his
         transgression, death denounced that day ? --Milton.

         The transgression is in the stealer.     --Shak.

   Syn: Fault; offense; crime; infringement; misdemeanor;
        misdeed; affront; sin.

Source : WordNet®

transgression
     n 1: the act of transgressing; the violation of a law or a duty
          or moral principle; "the boy was punished for the
          transgressions of his father" [syn: {evildoing}]
     2: the spreading of the sea over land as evidenced by the
        deposition of marine strata over terrestrial strata
     3: the action of going beyond or overstepping some boundary or
        limit