A centenary is a celebration of 100 years.
Centenary, or centennial, is 100 years. Purple is often used to celebrate 100 years.
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"Today we are here to celebrate a Centenary. Our organisation has been 100 years old now!"
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Centenary Jubilee
Centenary.
An event called a centenary takes place, a centenary can be celebrated from the founding a school to a simple golf course.
A hundred year anniversary is called a centennial or a centenary.