from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or belonging to the geologic time, rock series, or sedimentary deposits of the earlier of the two epochs of the Quaternary Period, characterized by the alternate appearance and recession of northern glaciation, the appearance and worldwide spread of hominids, and the extinction of numerous land mammals, such as the mammoths, mastodons, and saber-toothed tigers. See Table at geologic time.
- n. The Pleistocene Epoch or its system of deposits.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of a geologic epoch within the Neogene period from about 1.7 million to 11,000 years ago; marked by the evolution of man, and the extinction of the large mammals.
- proper n. The Pleistocene epoch.
from the GNU version of the Collaborative International Dictionary of English
- adj. Of or pertaining to the epoch, or the deposits, following the Tertiary, and immediately preceding man.
from The Century Dictionary and Cyclopedia
- n. The name given by geologists, with more or less vagueness, to the lower division of the Quaternary or Post-tertiary deposits, or to that division which cannot properly be included under the designation recent. See Post-tertiary, Tertiary, and Quaternary.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution
Greek pleistos, most; + -cene.(American Heritage® Dictionary of the English Language, Fourth Edition)