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tertium quid
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Tertiary
Ter·ti·ar·y


noun 
Definition:
 
first period of Cenozoic era: the period of geologic time, 65 million to 1.6 million years ago, during which mammals became dominant and modern plants evolved

Ter·ti·ar·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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