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mon·sieur | \ mə-ˈsyər 
, -ˈsyə, -ˈshyər, -ˈshyə; mə-ˈsir \
, -ˈsyə, -ˈshyər, -ˈshyə; mə-ˈsir \ plural messieurs\ mə-ˈsyər(z) , -ˈsyə(z) , -ˈshyər(z) , -ˈshyə(z) , mā- ; mə-ˈsir(z) \
, -ˈsyə(z) , -ˈshyər(z) , -ˈshyə(z) , mā- ; mə-ˈsir(z) \Definition of monsieur
: a Frenchman of high rank or station
—used as a title equivalent to Mister and prefixed to the name of a Frenchman
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The first known use of monsieur was in 1512
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