sesquicentennial
/ˌsɛskwɪsɛnˈtɛniəl/
noun
- A 150th anniversary or the celebration of it.
- The museum released a special exhibit to mark the sesquicentennial of the state's founding.
- The town is planning a huge parade for its sesquicentennial next summer.
- My grandparents attended the university's sesquicentennial gala last year.
adjective
- Relating to a 150th anniversary.
- She wrote a book about the sesquicentennial history of the railroad company.
- The sesquicentennial celebrations included fireworks, concerts, and a time capsule.
- The city council approved funding for a sesquicentennial monument in the park.