Parliamentarian can refer to a member or supporter of a Parliament, as in:Member of ParliamentRoundheads, supporters of the parliamentary cause in the English Civil War Parliamentarian can also refer to an expert adviser on parliamentary procedure, as in: Parliamentarian (consultant) - An officer or outside consultant designated by an organization to serve as an expert in parliamentary procedureParliamentarian of the United States House of RepresentativesParliamentarian of the United States Sena… (More on Parliamentarian)