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Noun: quatercentenary  ,kwa-tu,sen'te-nu-ree or ,kwa-tu,sen'tee-nu-ree
  1. The 400th anniversary (or the celebration of it)
    "The city organized a quatercentenary festival to commemorate its founding";
    - quatercentennial

Derived forms: quatercentenaries

Type of: anniversary, day of remembrance

Encyclopedia: Quatercentenary