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Adjective: semicentennial
  1. Of or relating to or marking the 50th anniversary
    "The university held a semicentennial celebration to commemorate its founding";
    - semicentenary
Noun: semicentennial
  1. The 50th anniversary (or the celebration of it)
    "The university held a grand semicentennial celebration";
    - semicentenary

Derived forms: semicentennials

Type of: anniversary, day of remembrance

Encyclopedia: Semicentennial