of or relating to the state of Mississippi or the Mississippi River
2.
(in North America) of, denoting, or formed in the lower of two subdivisions of the Carboniferous period, which lasted for 30 million years
See also Pennsylvanian (sense 2)
noun
3.
an inhabitant or native of the state of Mississippi
4. the Mississippian
Mississippian in American English
(ˌmɪsəˈsɪpiən)
adjective
1.
of the Mississippi River
2.
of the state of Mississippi
3. [sometimesm-]
designating or of the first geologic subdivision of the Carboniferous Period, characterized bythe development of vast limestone deposits, an abundance of ferns, amphibians, and crinoids, and the first winged insects