Definition of the dark ages noun from the Oxford Advanced Learner's Dictionary

     

    the dark ages

     noun
    noun
    BrE
     
    ; NAmE
     
    [plural]
     
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  1. 1the Dark Ages the period of European history between the end of the Roman Empire and the 10th century AD
  2. 2(often humorous) a period of history or a time when something was not developed or modern Back in the dark ages of computing, in about 1980, they started a software company. You’re living in the dark ages, Mum!
See the Oxford Advanced American Dictionary entry: the dark ages