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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
    - semicentennial
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)
    - semicentennial

Derived forms: semicentenaries

Type of: anniversary, day of remembrance