A hundred year anniversary is called a centennial or a centenary.
99 1/2 years of misery
A ten Carat Diamond
centenary
100 anniversary.
centenary
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quasquicentenial
Octocentennial or octocentenary.
Centennial means 100. If it is an anniversary, then 100 years. Remember that there are 100 cents (commonly called pennies) in one dollar.
Titanic 100 Year Anniversary - 1987 was released on: USA: November 1987
It is your 15th wedding anniversary. Hope this helps. Cbm
centennial
ghosts birthday
bicentennial
Purple