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English word
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WORDNET DICTIONARY
OXFORD DICTIONARY
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WORDNET DICTIONARY
Noun mason-dixon line has 1 sense
- mason-dixon line(n = noun.location) mason and dixon line, mason and dixon's line - the boundary between Maryland and Pennsylvania; symbolic dividing line between North and South before the American Civil War; is a kind of state boundary, state line
OXFORD DICTIONARY
mason-dixon line, n. (in the US) the boundary between Maryland and Pennsylvania, taken as the northern limit of the slave-owning States before the abolition of slavery.
Etymology
C. Mason & J. Dixon, 18th-c. English astronomers who surveyed it