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glacial period is a noun meaning "any period of time during which glaciers covered a large part of the earth's surface". It carries one recorded sense.
any period of time during which glaciers covered a large part of the earth's surface
“the most recent ice age was during the Pleistocene”
Definitions, synonyms and semantic relations for glacial period come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.