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Entry 2 senses Webster, 1913

Archaism

· Ar·cha·ism · IPA /ˈɑɹ.kiˌɪz.əm/
01 n. An ancient, antiquated, or old-fashioned, word, expression, or idiom; a word or form of speech no longer in common use.
  1. 1.
    An ancient, antiquated, or old-fashioned, word, expression, or idiom; a word or form of speech no longer in common use.
  2. 2.
    Antiquity of style or use; obsoleteness.
    “A select vocabulary corresponding (in point of archaism and remoteness from ordinary use) to our Scriptural vocabulary.” De Quincey.