Usually means: Boundary between northern, southern states.
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We found 19 dictionaries that define the word Mason-Dixon Line:

General (16 matching dictionaries)
  1. Mason-Dixon Line: Merriam-Webster
  2. Mason-Dixon Line: American Heritage Dictionary of the English Language
  3. Mason-Dixon Line, Mason-Dixon Line: Collins English Dictionary
  4. Mason-Dixon line: Vocabulary.com
  5. the Mason-Dixon Line, the Mason-Dixon line: Cambridge Advanced Learner's Dictionary
  6. Mason-Dixon Line: Wiktionary
  7. Mason-Dixon line: Infoplease Dictionary
  8. Mason-Dixon line: Dictionary.com
  9. Mason-Dixon Line: Online Etymology Dictionary
  10. Mason-Dixon Line, Mason-Dixon line, Mason-dixon line: Wikipedia, the Free Encyclopedia
  11. Mason-dixon line: Rhymezone
  12. mason-dixon line: FreeDictionary.org
  13. mason-dixon line: Mnemonic Dictionary
  14. Mason-Dixon Line: TheFreeDictionary.com

Art (1 matching dictionary)
  1. Glossary of Stamp Collecting Terms (No longer online)

Business (1 matching dictionary)
  1. Travel Industry Dictionary (No longer online)

Computing (1 matching dictionary)
  1. Mason-Dixon Line: Encyclopedia

Definitions from Wiktionary (Mason-Dixon line)

noun:  (historical) The boundary line between Pennsylvania and Maryland, as run (1764–1767) by Charles Mason and Jeremiah Dixon, that, before abolition, defined part of the northern boundary of states in which slavery was permitted.
noun:  The boundary between the free and slave states at the time of the American Civil War, or between states with different segregationist policies in the Jim Crow era.
noun:  Alternative letter-case form of Mason-Dixon Line [(historical) The boundary line between Pennsylvania and Maryland, as run (1764–1767) by Charles Mason and Jeremiah Dixon, that, before abolition, defined part of the northern boundary of states in which slavery was permitted.]

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