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English definition of “the Mason-Dixon Line”

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the Mason-Dixon Line

noun [S] uk   /ˌmeɪ.sənˈdɪk.sənˌlaɪn/ us  
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 US
(Definition of the Mason-Dixon Line from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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