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Adjective: centennial  sen'te-nee-ul
  1. Of or relating to or completing a period of 100 years
    "centennial celebration";
    - centenary
Noun: centennial  sen'te-nee-ul
  1. The 100th anniversary (or the celebration of it)
    - centenary

Derived forms: centennials

Type of: anniversary, day of remembrance

Encyclopedia: Centennial, Portland, Oregon