sesquicentennial

From sesqui- (“one-and-a-half”) +‎ centennial (“of 100 years”); surface analysis sesqui- +‎ cent- +‎ -ennial.

• IPA^(key): /ˌsɛskwɪsɛnˈtɛni.əl/

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sesquicentennial (not comparable)

1. Occurring every 150 years.
2. Of, or relating to a sesquicentenary.

sesquicentennial (plural sesquicentennials)

1. A 150th anniversary.

   The city celebrated its sesquicentennial last year.

• sesquicentenarian
• sesquicentenary