1. (noun) any period of time during which glaciers covered a large part of the earth's surface

• glacial period
• ice age

2. (noun) from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution

• pleistocene
• pleistocene epoch

1. (noun) any period of time during which glaciers covered a large part of the earth's surface

• geological period
• period