The Collaborative International Dictionary of English v.0.48:

Infract \In*fract"\ ([i^]n*fr[a^]kt"), a. [L. infractus; pref.
   in- not + fractus. p. p. of frangere to break.]
   Not broken or fractured; unharmed; whole. [Obs.] --Chapman.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Infract \In*fract"\, v. t. [imp. & p. p. Infracted; p. pr. &
   vb. n. Infracting.] [L. infractus, p. p. of of infringere.
   See Infringe.]
   To break; to infringe. [R.] --Thomson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

infract
    v 1: act in disregard of laws, rules, contracts, or promises;
         "offend all laws of humanity"; "violate the basic laws or
         human civilization"; "break a law"; "break a promise" [syn:
         transgress, offend, infract, violate, go against,
         breach, break] [ant: keep, observe]