Source : Webster's Revised Unabridged Dictionary (1913)

Frank \Frank\, v. t. [imp. & p. p. {Franked}; p. pr. & vb. n.
   {Franking}.]
   1. To send by public conveyance free of expense. --Dickens.

   2. To extempt from charge for postage, as a letter, package,
      or packet, etc.