Definition of Missouri Compromise in English:

Missouri Compromise

noun

US
historical
  • The measure passed by the U.S. Congress in 1820 (and repealed in 1854) which provided that Missouri should be admitted to the Union as a Slave State, but forbade slavery in any other part of the Louisiana Purchase lying north of the latitude 36° 30′.

Origin

Early 19th century; earliest use found in Thomas Hart Benton (1782–1858).