| SIO | an imaginary place considered to be perfect or ideal |
|---|---|
| SIO | Jewish republic in southwestern Asia at eastern end of Mediterranean |
| SIO | originally a stronghold captured by David (the 2nd king of the Israelites) |
| SIO | a family of North American Indian languages spoken by the Sioux |
| SIO | a member of a group of North American Indian peoples who spoke a Siouan language and who ranged from Lake Michigan to the Rocky Mountains |
| SIO | of or relating to the Sioux people or their language and culture |
| SIO | a family of North American Indian languages spoken by the Sioux |
| SIO | able to communicate in a Siouan language |
| SIO | a member of a group of North American Indian peoples who spoke a Siouan language and who ranged from Lake Michigan to the Rocky Mountains |
| SIO | a city in northeastern Iowa |
| SIO | largest city in South Dakota |