Definition of Mason–Dixon in English:

Mason–Dixon

(also Mason-Dixon, Mason and Dixon's)

noun

US
  • The Mason–Dixon line.

Origin

Late 18th century (in an earlier sense). From the names of Charles Mason and Jeremiah Dixon, English surveyors and astronomers, who defined most of the boundary between Pennsylvania and Maryland by survey in 1763–7.

Pronunciation

Mason–Dixon

/ˌmeɪsnˈdɪksn/