[nāi] (n) EN: master ; lord ; ruler ; chief ; boss ; leaderFR: maître [ m ] ; monsieur [ m ] ; sieur [ m ] (vx) ; maître [ m ] ; patron [ m ] , chef [ m ]
‖n.; pl.Messieurs [ F., fr. mon my + Sieur, abbrev. of seigneur lord. See Monseigneur. ] 1. The common title of civility in France in speaking to, or of, a man; Mr. or Sir. [ Represented by the abbreviation M. or Mons. in the singular, and by MM. or Messrs. in the plural. ] [ 1913 Webster ]
2. The oldest brother of the king of France. [ 1913 Webster ]