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WordReference Random House Unabridged Dictionary of American English © 2024Ma′son-Dix′on line′ (mā′sən dik′sən),USA pronunciation - Place Names, American Historythe boundary between Pennsylvania and Maryland, partly surveyed by Charles Mason and Jeremiah Dixon between 1763 and 1767, popularly considered before the end of slavery as a line of demarcation between free and slave states.
Also, Ma′son and Dix′on line′. Collins Concise English Dictionary © HarperCollins Publishers:: Mason-Dixon Line, Mason and Dixon Line /ˈmeɪsə n ˈdɪksən/ n - the state boundary between Maryland and Pennsylvania: surveyed between 1763 and 1767 by Charles Mason and Jeremiah Dixon; popularly regarded as the dividing line between North and South, esp between the free and the slave states before the American Civil War
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