Centenary (noun)

1. The hundredth anniversary of a significant event.
2. A period of 100 years.

Origin:

From latin centum ("one hundred") + -ary.

Examples:

1. The company celebrated its centenary.
2. The centenary of the country's independence was celebrated with a parade.
3. The school celebrated its centenary with a series of special events.
4. The centenary of the birth of the famous author was marked by the release of a new edition of his works.
5. The museum marked the centenary of the artist's death with a special exhibition.