Definition of Mason–Dixon line in English:

Mason–Dixon line

Syllabification: Ma·son–Dix·on line
Pronunciation: /ˌmāsənˈdiksən ˌlīn
 
/

noun

(In the US) the boundary between Maryland and Pennsylvania, taken as the northern limit of the slave-owning states before the abolition of slavery.

Origin

named after Charles Mason (1728–1786) and Jeremiah Dixon (1733–1779), the English astronomers who surveyed it in 1763–67.

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