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Adjective: quincentennial
  1. Of or relating to a 500th anniversary
    "the quincentennial celebration of the founding of the city";
    - quincentenary
Noun: quincentennial
  1. The 500th anniversary (or the celebration of it)
    "Columbus's voyage was commemorated during its quincentennial in 1992";
    - quincentenary

Derived forms: quincentennials

Type of: anniversary, day of remembrance

Encyclopedia: Quincentennial