in·fringe·ment \-jmənt\noun (-s) 1.: the act of infringing : breach, violation, nonfulfillment < infringement of a treaty > < infringement of the constitution > 2.: an encroachment or trespass on a right or privilege : trespass: a.: the unlawful manufacture, use, or sale of a patented or copyrighted article, such as constitutes a tort in law b.: the unlawful use of a trademark or trade name Synonyms:see breach