pleistocene Meaning, Definition & Usage

  1. noun from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution
    Glacial epoch; Pleistocene epoch.

WordNet

Pleis"to*cene adjective
Etymology
Gr. most + new.
Definitions
  1. (Geol.) Of or pertaining to the epoch, or the deposits, following the Tertiary, and immediately preceding man. -- n. The Pleistocene epoch, or deposits.

Webster 1913