anachronism - definition and synonyms

noun [countable] 

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/əˈnækrəˌnɪz(ə)m/
singularanachronism
pluralanachronisms
  1. something that is no longer suitable for or relevant to modern times

    She regards the marriage ceremony as a quaint anachronism.

derived word

anachronistic

 

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/əˌnækrəˈnɪstɪk/
adjective