English

Definition of the Mason-Dixon Line noun from the Oxford Advanced Learner's Dictionary

 

the Mason-Dixon Line

 noun
noun
BrE BrE//ˌmeɪsn ˈdɪksn laɪn//
 
; NAmE NAmE//ˌmeɪsn ˈdɪksn laɪn//
 
[singular]
 
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the border between the US states of Maryland and Pennsylvania that is thought of as the dividing line between the south of the US and the north. In the past it formed the northern border of the states where slaves were owned.
See the Oxford Advanced American Dictionary entry: the Mason-Dixon Line