ALL meanings of mason-dixon line
Ma·son-Dix·on line
M m - noun mason-dixon line US north-south division 1
- noun mason-dixon line the 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. 1
- noun mason-dixon line 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 0
- noun mason-dixon line boundary line between Pa. & Md., regarded, before the Civil War, as separating the free states from the slave states or, now, the North from the South 0