dodoism

/ˈdoʊdoʊɪzəm/
noun
  1. An outdated or old-fashioned idea, practice, or attitude; something that is obsolete or no longer relevant.
    • His belief that handwritten letters are the only proper form of communication is a charming dodoism.
    • The company's refusal to use email is a dodoism that hurts its business.
    • Many people view traditional grammar rules as dodoisms in the age of texting.
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