Definition of date back phrasal verb from the Oxford Advanced Learner's Dictionary

  

date back

 phrasal verb
phrasal verb
 
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Phrasal Verbs

date back (to…)

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date from…

 
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 to have existed since a particular time in the past or for the length of time mentioned The college dates back to medieval times. The custom dates back hundreds of years. a law dating from the 17th century Our friendship dates back to the late 70s.
See the Oxford Advanced American Dictionary entry: date back