The Collaborative International Dictionary of English v.0.48:

Infringe \In*fringe"\, v. i.
   1. To break, violate, or transgress some contract, rule, or
      law; to injure; to offend.
      [1913 Webster]

   2. To encroach; to trespass; -- followed by on or upon; as,
      to infringe upon the rights of another.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Infringe \In*fringe"\, v. t. [imp. & p. p. Infringed; p. pr. &
   vb. n. Infringing.] [L. infringere; pref. in- in + frangere
   to break. See Fraction, and cf. Infract .]
   1. To break; to violate; to transgress; to neglect to fulfill
      or obey; as, to infringe a law, right, or contract.
      [1913 Webster]

            If the first that did the edict infringe,
            Had answered for his deed.            --Shak.
      [1913 Webster]

            The peace . . . was infringed by Appius Claudius.
                                                  --Golding.
      [1913 Webster]

   2. To hinder; to destroy; as, to infringe efficacy; to
      infringe delight or power. [Obs.] --Hooker.
      [1913 Webster]

WordNet (r) 3.0 (2006):

infringe
    v 1: go against, as of rules and laws; "He ran afoul of the
         law"; "This behavior conflicts with our rules" [syn:
         conflict, run afoul, infringe, contravene]
    2: advance beyond the usual limit [syn: encroach, infringe,
       impinge]