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

See Stone Age in American Heritage Dictionary 4

noun
  1. The earliest known period of human culture, characterized by the use of stone tools. See Usage Note at Three Age system.
  2. Slang An extremely backward or primitive era or state: back in the Stone Age of television broadcasting.

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