|1.||[ noun ] (geology) any period of time during which glaciers covered a large part of the earth's surface|
"the most recent ice age was during the Pleistocene"
|Related terms:||period prehistory|
|2.||[ noun ] (geology) from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution|
|Related terms:||epoch Quaternary|