Parliamentarian /(?)/

Par·lia·men·ta·ri·an

Parliamentarian

a.
  1. Of or pertaining to Parliament.

Parliamentarian

n.
  1. One who adhered to the Parliament, in opposition to King Charles I. (Eng. Hist.)
  2. One versed in the rules and usages of Parliament or similar deliberative assemblies; as, an accomplished parliamentarian.