Source : Webster's Revised Unabridged Dictionary (1913)

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.