1 tr. a act contrary to; violate (a law, an oath, etc.). b act in defiance of (another's rights etc.).
2 intr. (usu. foll. by on, upon) encroach; trespass.
Derivatives:
infringement n. infringer n.
Etymology: L infringere infract- (as IN-(2), frangere break)
Useful english dictionary. 2012.