parliamentarian

parliament +‎ -arian

parliamentarian (plural parliamentarians)

1. A member of a parliament, congress or an elected national legislative body of another name.

   Synonyms: congressman, MP, deputy

2. A person well-versed in parliamentary procedure.
3. An officer in most legislative bodies charged with being well-versed in the parliamentary rules of that legislative house, and whose rulings are taken as authoritative, to be appealed only to the whole of the house itself under special rules.

• Parliamentarian

parliamentarian (comparative more parliamentarian, superlative most parliamentarian)

1. Of or relating to a parliament; favouring the establishment of a parliament.

   Synonym: parliamentary

   a parliamentarian democracy; the parliamentarian movement

   • 1946, Office of United States Chief Counsel For Prosecution of Axis Criminality, Nazi Conspiracy and Aggression, Washington, Volume 1, citing Wilhelm Frick,

     Our participation in the parliament does not indicate a support, but rather an undermining of the parliamentarian system.

2. (historical) Of or relating to the Parliamentarians (supporters of the parliament during the English Civil War (1642–1651)).
   • 1685, George Bate, Elenchus Motuum Nuperorum in Anglia, or, A Short Historical Account of the Rise and Progress of the Late Troubles in England, London, p. 41,

     […] Deputies were sent with Commissions into all the Counties; and the Parliamentarian Rebels by force and their own authority, invade the Militia, which they could not obtain from the King by petitioning.

   • 1692, Anthony Wood, Athenæ Oxonienses, London: Thomas Bennet, Volume 2, p. 291,

     But while he continued there, he shew’d himself a Dunce, a Tale-bearer to the Parliamentarian Visitors that then acted in the University, and a factious person.

   • 1771, Oliver Goldsmith, The History of England: from the Earliest Times to the Death of George II, London: T. Davies et al., Volume 3, Chapter 31, p. 271,

     The Scotch and parliamentarian army had joined, and were besieging York; when prince Rupert, joined by the marquis of Newcastle, determined to raise the siege.

   • 1895, Hereford Brooke George, Battles of English History, London: Methuen, Chapter 9, p. 128,

     There were large regions which were very decidedly royalist, others almost as distinctly parliamentarian […]