Inflected forms: pl. Mes·sieurs ( m-syœ, msrz) 1.abbr.M. Used as a courtesy title before the surname, full name, or professional title of a man in a French-speaking area: Monsieur Cartier; Monsieur Jacques Cartier.2.monsieur Used as a form of polite address for a man in a French-speaking area.
ETYMOLOGY:
French, from Old French : mon, my (from Latin meum, accusative of meus; see me-1 in Appendix I) + sieur, lord, sir (from Vulgar Latin *seiorem, accusative of *seior; see sire).
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