Monsieur

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Monsieur (/məˈsjɜːr/ mə-SYUR; French: [məsjø] ^ⓘ; pl. Messieurs /ˈmɛsərz, meɪˈsjɜːr(z)/ MESS-ərz, may-SYUR(Z); French: [mesjø] ^ⓘ; 1512, from Middle French mon sieur, literally "my lord"^[1]) is an honorific title that was used to refer to or address the eldest living brother of the king in the French royal court. It has now become the customary French title of respect and term of address for a French-speaking man, corresponding to such English titles as Mr. or sir.^[2]