parliamentarian n1 : an expert in the rules and usages of a parliament or other deliberative assembly
: an officer of a legislative body acting as adviser to the presiding officer on matters of procedure NOTE: The parliamentarian of the U.S. House of Representatives is appointed by the Speaker of the House. The Secretary of the Senate appoints the Senate's parliamentarian with approval of the majority leader.
2 : a member of a parliament
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.