from the GNU version of the Collaborative International Dictionary of English
- adj. a period during which the climate of the modern temperate regions was polar, and ice covered large portions of the northern hemisphere to the mountain tops.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution
- n. any period of time during which glaciers covered a large part of the earth's surface
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