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pennsylvanian period is a noun meaning "from 310 million to 280 million years ago; warm climate; swampy land". It carries one recorded sense.
from 310 million to 280 million years ago; warm climate; swampy land
Definitions, synonyms and semantic relations for pennsylvanian period come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.