2 Geology of, relating to, or denoting the early part of the Carboniferous period in North America from about 363 to 323 million years ago, following the Devonian and preceding the Pennsylvanian.
Archaeology of, relating to, or denoting a settled culture of the southeastern US, dated to about ad 800–1300.
noun
1a native or inhabitant of Mississippi.
2 (the Mississippian) Geology the Mississippian period or the system of rocks deposited during it.
