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English word sesquicentenary comes from English sesqui- (1½; 1½ times. In a ratio of 3 to 2.), English centenary
sesqui- (English)
1½; 1½ times. In a ratio of 3 to 2.
centenary (English)
A one-hundredth anniversary. Of, pertaining to, or completing a period of 100 years.
sesquicentenary (English)
A 150-year anniversary.