Sesquicentennial (noun)

A celebration of the 150th anniversary of a significant event.

Origin:

The word 'sesquicentennial' is derived from the latin word 'sesqui' meaning 'one and a half' and the latin word 'centum' meaning 'hundred'. it refers to a period of 150 years.

Examples:

1. The city was preparing for its sesquicentennial, marking 150 years since its founding.
2. The sesquicentennial of the signing of the Declaration of Independence was a major event in the history of the United States.
3. The sesquicentennial of the end of the Civil War was marked by a number of ceremonies and events.
4. The school's sesquicentennial was a time of great pride and celebration for its alumni.
5. The sesquicentennial of the invention of the light bulb was celebrated with a number of special events and exhibitions.