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Noun: semicentenary  ,se-mee,sen'te-nu-ree [N. Amer], ,se-mee,sen'tee-nu-ree [Brit]
  1. The 50th anniversary (or the celebration of it)
    "The university held a grand semicentenary celebration";
    - semicentennial
Adjective: semicentenary  ,se-mee,sen'te-nu-ree [N. Amer], ,se-mee,sen'tee-nu-ree [Brit]
  1. Of or relating to or marking the 50th anniversary
    "The university held a semicentenary celebration to commemorate its founding";
    - semicentennial

Derived forms: semicentenaries

Type of: anniversary, day of remembrance