glacial epoch Meaning, Definition & Usage

1. noun any period of time during which glaciers covered a large part of the earth's surface
   glacial period; ice age.
   
   • the most recent ice age was during the Pleistocene
2. noun from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution
   Pleistocene; Pleistocene epoch.
   

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