The Collaborative International Dictionary of English v.0.48:

Infraction \In*frac"tion\, n. [L. infractio: cf. F. infraction.]
   The act of infracting or breaking; breach; violation;
   nonobservance; infringement; as, an infraction of a treaty,
   compact, rule, or law. --I. Watts.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "infraction":
   aberrance, aberrancy, abnormality, bad faith, breach,
   breach of contract, breach of faith, breach of law,
   breach of privilege, breach of promise, breach of trust, breaking,
   civil disobedience, contravention, crime, criminality, delinquency,
   deviance, deviancy, disobedience, encroachment, error, faux pas,
   frowardness, illegality, improperness, impropriety,
   inappropriateness, incorrectness, incursion, indecorousness,
   indecorum, indiscipline, indocility, infringement, inroad,
   insubordination, intractability, intrusion, lapse, lawbreaking,
   lawlessness, naughtiness, noncompliance, nonconformity,
   noncooperation, nonobedience, offense, overstepping,
   passive resistance, recusancy, sin, sinfulness, slip,
   transgression, trespass, trespassing, uncooperativeness,
   unduteousness, undutifulness, unfitness, unfittingness,
   unlawfulness, unrighteousness, unseemliness, unsubmissiveness,
   unsuitability, usurpation, violation, violation of law,
   waywardness, wickedness, willful disobedience, wrong, wrongfulness,
   wrongness