archaism

/ˈɑrkiˌɪzəm/
noun
  1. An old-fashioned word, phrase, or style that is no longer in common use.
    • Using 'thee' in modern conversation is an archaism.
    • Teachers sometimes explain archaisms when reading Shakespeare.
    • The novel is full of archaisms that give it a historical flavor.
  2. The quality or state of being old-fashioned or outdated.
    • The archaism of the building's design made it stand out among modern skyscrapers.
    • His speech had a charming archaism that reminded people of an earlier era.
    • The archaism of the law meant it was rarely enforced.
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