'Monseigneur' definitions:

Definition of 'Monseigneur'

From: GCIDE

Monseigneur \Mon`sei`gneur"\, n.; pl. Messeigneurs. [F., fr. mon my + seigneur lord, L. senior older. See Senior, and cf. Monsieur.] 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.) [1913 Webster]