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
Origin of Plioceneplio- + -cene
the Pliocene Epoch or its rocks
Of, relating to, or being the epoch of geologic time from 5 to 1.8 million years ago, the most recent epoch of the Tertiary Period. It is characterized by the appearance of distinctly modern animals and by the expansion of grasslands. See Table at geologic time.
The Pliocene Epoch.
Origin of PlioceneGreek pleiōn, more; see pel&schwa;-1 in Indo-European roots + –cene.
- (geology) The Pliocene epoch.