- of or relating to the state of Mississippi or the Mississippi River.
- noting or pertaining to a period of the Paleozoic Era, occurring from about 345 million to 310 million years ago and characterized as the age of amphibians.
- a native or inhabitant of Mississippi.
- the Mississippian Period or System: the former is sometimes considered an epoch of the Carboniferous Period.
- of or relating to the state of Mississippi or the Mississippi River
- (in North America) of, denoting, or formed in the lower of two subdivisions of the Carboniferous period, which lasted for 30 million years
- an inhabitant or native of the state of Mississippi
- the Mississippian period or rock system equivalent to the lower Carboniferous of Europe
