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]