sesquicentennial
adjective
- every 150 years
noun
- hundred and fiftieth anniversary
Wiktionary
Pronunciation: /ˌsɛskwɪsɛnˈtɛni.əl/
adj
Etymology: From sesqui- (“one-and-a-half”) + centennial (“of 100 years”). By surface analysis, sesqui- + cent- + -ennial.
- Occurring every 150 years.
- Of, or relating to a sesquicentenary.
noun
Etymology: From sesqui- (“one-and-a-half”) + centennial (“of 100 years”). By surface analysis, sesqui- + cent- + -ennial.
- A 150th anniversary.
“The city celebrated its sesquicentennial last year.”