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the Mason-Dixon Line

noun [S]
 
 
/ˌmeɪ.sənˈdɪk.sənˌlaɪn/

Definition

the border between the states of Maryland and Pennsylvania in the US, traditionally considered to mark the division between the north and south of the USTerritorial boundaries
(Definition of the Mason-Dixon Line noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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