Monseigneur, n.

(mŏng-sān'yur), n.; pl. MESSEIGNEURS (mes-sān'yur). [Fr. mon, my, and seigneur, lord; Lat. senior, older, compar. of senex, old.] My lord; your grace or highness;—a title of a person of high birth or rank; as, Monseigneur the Prince, or Monseigneur the Chancellor. It was given, specifically, to the dauphin, before the French revolution of 1789.