Monseigneur :: Monseigneur (n.) My lord; -- a title in France of a person of high birth or rank; as, Monseigneur the Prince, or Monseigneur the Archibishop. It was given, specifically, to the dauphin, before the Revolution of 1789. (Abbrev. Mgr.).
Seigneurial :: Seigneurial (a.) Of or pertaining to the lord of a manor; manorial.
Seigneurial :: Seigneurial (a.) Vested with large powers; independent.