from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A cold period marked by extensive glaciation.
- noun The most recent glacial period, which occurred during the Pleistocene Epoch.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Any of several
cold periodsin the historyof the earthmarked by episodesof extensive glaciation alternatingwith episodes of relative warmth.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun any period of time during which glaciers covered a large part of the earth's surface
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