Learn how to say Pleistocene correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word Pleistocene:
relating to or denoting the first epoch of the Quaternary period, between the Pliocene and Holocene epochs.
(as noun the Pleistocene) the Pleistocene epoch or the system of deposits laid down during it.
The Pleistocene epoch lasted from 1,640,000 to about 10,000 years ago. It was marked by great fluctuations in temperature that caused the ice ages, with glacial periods followed by warmer interglacial periods. Several forms of fossil human, leading up to modern humans, appeared during this epoch
mid 19th century: from Greek pleistos ‘most’ + kainos ‘new’