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Noun: sesquicentennial  ,se-skwi,sen'ten-ee-ul
  1. The 150th anniversary (or the celebration of it)
    "The town planned a grand parade for its sesquicentennial"
Adjective: sesquicentennial  ,se-skwi,sen'ten-ee-ul
  1. Of or relating to a 150th anniversary
    "The town planned a sesquicentennial celebration to mark its founding"

Derived forms: sesquicentennials

Type of: anniversary, day of remembrance

Encyclopedia: Sesquicentennial