Definition

1. Proper noun:
   • A historical boundary: "Mason and Dixon's Line" refers to the surveyed border between the U.S. states of Maryland and Pennsylvania.
   • A symbolic demarcation: It is famously known as the cultural and political dividing line between the Northern and Southern United States in the period before the American Civil War.

Usage Examples

• Proper noun:
  • The dispute was settled by the establishment of Mason and Dixon's Line.
  • Before the war, states north of Mason and Dixon's Line generally prohibited slavery.

Advanced Usage

• "south of the Mason-Dixon Line": Used idiomatically to refer to the Southern United States.
  • His accent indicated he was from south of the Mason-Dixon Line.
• "the Mason-Dixon": Sometimes used as a shortened, informal reference.
  • They lived just above the Mason-Dixon.

Variants and Related Words

• Mason-Dixon Line (n): The most common modern spelling, often hyphenated.
  • The Mason-Dixon Line is a key part of American history.
• Mason and Dixon Line (n): A common variant without the possessive.

Synonyms

• The dividing line: A general term for a separator, often used in its historical context.
• The boundary line: Specifically referencing its function as a border.

Notes on Meaning

This term has two primary, intertwined meanings: 1. The Historical Survey: The actual, physical boundary line surveyed by astronomers Charles Mason and Jeremiah Dixon between 1763 and 1767. 2. The Symbolic Divide: Its later adoption as a metaphor for the division between free states and slave states, and more broadly between the cultural regions of the North and South. This symbolic meaning is its most significant and enduring usage.

Noun

1. the boundary between Maryland and Pennsylvania; symbolic dividing line between North and South before the American Civil War