The Collaborative International Dictionary of English v.0.48:

Infringement \In*fringe"ment\, n.
   1. The act of infringing; breach; violation; nonfulfillment;
      as, the infringement of a treaty, compact, law, or
      constitution.
      [1913 Webster]

            The punishing of this infringement is proper to that
            jurisdiction against which the contempt is.
                                                  --Clarendon.
      [1913 Webster]

   2. An encroachment on a patent, copyright, or other special
      privilege; a trespass.
      [1913 Webster]

WordNet (r) 3.0 (2006):

infringement
    n 1: an act that disregards an agreement or a right; "he claimed
         a violation of his rights under the Fifth Amendment" [syn:
         violation, infringement]
    2: a crime less serious than a felony [syn: misdemeanor,
       misdemeanour, infraction, violation, infringement]

Moby Thesaurus II by Grady Ward, 1.0:

114 Moby Thesaurus words for "infringement":
   adoption, appropriation, arrogation, assumption, bad faith,
   bankruptcy, borrowed plumes, breach, breach of contract,
   breach of faith, breach of law, breach of privilege,
   breach of promise, breach of trust, breakage, breakdown, breaking,
   civil disobedience, collapse, contravention, copying, crack-up,
   crippling, damage, derivation, deriving, destruction, detriment,
   dilapidation, disablement, disobedience, disrepair, encroachment,
   entrance, entrenchment, frowardness, harm, hobbling, hurt, hurting,
   imitation, impairment, impingement, imposition, incapacitation,
   incursion, indiscipline, indocility, infiltration, influx,
   infraction, injection, injury, inroad, insinuation,
   insubordination, interference, interjection, interloping,
   interposition, interposure, interruption, intervention,
   intractability, intrusion, invasion, irruption, lawbreaking,
   lawlessness, loss, maiming, mayhem, mischief, mocking, mutilation,
   naughtiness, noncompliance, nonconformity, noncooperation,
   nonobedience, obtrusion, offense, overstepping, passive resistance,
   pasticcio, pastiche, pirating, plagiarism, plagiary, playing God,
   recusancy, ruination, ruinousness, sabotage, scathe, seizure,
   sickening, simulation, spoiling, taking, transgression, trespass,
   trespassing, uncooperativeness, unduteousness, undutifulness,
   unlawful entry, unsubmissiveness, usurpation, violation,
   violation of law, waywardness, weakening, willful disobedience