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English word sesquicentennial comes from English sesqui- (1½; 1½ times. In a ratio of 3 to 2.), English centennial
sesqui- (English)
1½; 1½ times. In a ratio of 3 to 2.
centennial (English)
Happening once in a hundred years.. Lasting or aged a hundred years.. Relating to, or associated with, the commemoration of an event that happened a hundred years before. The hundredth anniversary of an event or happening.
sesquicentennial (English)
Occurring every 150 years.. Of, or relating to a sesquicentenary. A 150th anniversary.