Pliocene Definition
 plīə-sēn 
    adjective
  
 Designating or of the second geologic epoch of the Neogene, characterized by the joining of what are now North and South America, the formation of the Arctic ice cap, the extensive migration of mammals between continents, and the development of apelike humans in Africa.
 Webster's New World 
    noun
  
 The Pliocene Epoch.
 American Heritage 
Synonyms: 
  
- Pliocene epoch
    pronoun
  
 (geology) The Pliocene epoch.
 Wiktionary 
Idioms, Phrasal Verbs Related to Pliocene
- the Pliocene
Origin of Pliocene
-  Greek pleiōn more pelə-1 in Indo-European roots –cene From American Heritage Dictionary of the English Language, 5th Edition 
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