Penn·syl·va·nian | \ ˌpen(t)-səl-ˈvā-nyən 
, -nē-ə-n \
, -nē-ə-n \Definition of Pennsylvanian
1 : of or relating to Pennsylvania or its people
2 : of, relating to, or being the period of the Paleozoic era in North America between the Mississippian and Permian or the corresponding system of rocks — see Geologic Time Table
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The first known use of Pennsylvanian was in 1698
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