百ひゃく年ねん祭さい

noun

centenary; centennial celebration

Refers to a 100th anniversary event or festival. Often used for institutional or national anniversaries.

• 来らい年ねん、市しの百ひゃく年ねん祭さいが開ひらかれる。

  The city's centennial celebration will be held next year.

• 大だい学がくの百ひゃく年ねん祭さいには多おおくの卒そつ業ぎょう生せいが集あつまった。

  Many alumni gathered for the university's centenary.