monseigneur Meaning, Definition & Usage

Mon`sei`gneur" noun
Etymology
F., fr. mon my + seigneur lord, L. senior older. See Senior, and cf. Monsieur.
Wordforms
plural Messeigneurs
Definitions
  1. 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.)

Webster 1913