Real Dictionary

Stone Age
a period in human culture during which stone implements are used; specif., the time of the Paleolithic, Mesolithic, and Neolithic periods of the Old World
modifier: of or relating to this period
noun: a period in human culture identified by the use of stone implements and usually divided into the Palaeolithic, Mesolithic, and Neolithic stages
noun: the period in the history of humankind, preceding the Bronze Age and the Iron Age, and marked by the use of stone implements and weapons: subdivided into the Paleolithic, Mesolithic, and Neolithic periods
proper noun: The Stone Age is a very early period of human history, when people used tools and weapons made of stone, not metal.