archaism Meaning, Definition & Usage

  1. noun the use of an archaic expression
    archaicism.

WordNet

Ar"cha*ism noun
Etymology
Gr. , fr. ancient, fr. beginning: cf. F. archaïsme. See Arch, a.
Definitions
  1. An ancient, antiquated, or old-fashioned, word, expression, or idiom; a word or form of speech no longer in common use.
  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.

Webster 1913