Etymology
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centennial (adj.)

"consisting of or lasting 100 years, happening every 100 years," 1789, from Latin centum "one hundred" (see hundred) + ending from biennial. As a noun, "a hundredth anniversary celebration," from 1876; the older noun is centenary.

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Definitions of centennial
1
centennial (n.)
the 100th anniversary (or the celebration of it);
Synonyms: centenary
2
centennial (adj.)
of or relating to or completing a period of 100 years;
centennial celebration
Synonyms: centenary
From wordnet.princeton.edu