Historical territory in which there is no slavery; esp., any territory in the U.S. where slavery was prohibited before the Civil War
[alsof- s-] opposed to the extension of slavery; specif., designating or of a former (1848-54) political party (Free-Soil Party) that opposed the spread of slavery into the Territories
US territory in which slavery was prohibited before the Civil War.
- Prohibiting slavery: free-soil states.
- a. Opposing the extension of slavery before the US Civil War.b. Free-Soil Of or being a US political party founded in 1848 to oppose the extension of slavery into US territories and the admission of slave states into the Union.