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Quaternary
Qua·ter·nar·y


noun 
Definition:
 
most recent geologic period: the current period of geologic time, beginning 1.6 million years ago and characterized by the appearance and dominance of humans

Qua·ter·nar·y adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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