of or ending a period of 150 years
a 150th anniversary or its commemoration
Of or relating to a period of 150 years.
A 150th anniversary or its celebration.
- Occurring every 150 years
- Of, or relating to a sesquicentenary
- A 150th anniversary.
- The city celebrated its sesquicentennial last year.
sesqui- (“one-and-a-half") +"Ž centennial (“of 100 years")