Source : Webster's Revised Unabridged Dictionary (1913)

Parliamentary \Par`lia*men"ta*ry\, a. [Cf. F. parlementaire.]
   1. Of or pertaining to Parliament; as, parliamentary
      authority. --Bacon.

   2. Enacted or done by Parliament; as, a parliamentary act.
      --Sir M. Hale.

   3. According to the rules and usages of Parliament or of
      deliberative bodies; as, a parliamentary motion.

   {Parliamentary agent}, a person, usually a solicitor,
      professionally employed by private parties to explain and
      recommend claims, bills, etc., under consideration of
      Parliament. [Eng.]

   {Parliamentary train}, one of the trains which, by act of
      Parliament, railway companies are required to run for the
      conveyance of third-class passengers at a reduced rate.
      [Eng.]

Source : WordNet®

parliamentary agent
     n : a person who is employed to look after the affairs of
         businesses that are affected by legislation of the
         British Parliament