Definition of the Stone Age noun from the Oxford Advanced American Dictionary

     

    the Stone Age

     noun
    noun
     
    [singular]
     
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  1. 1the very early period of human history when tools and weapons were made of stone
  2. 2(figurative) My dad's taste in music is from the Stone Age (= very old-fashioned).
 
adjective [only before noun] (figurative) stone-age (= very out-of-date) computers
See the Oxford Advanced Learner's Dictionary entry: the Stone Age