Hundredth anniversary (9)

I believe the answer is:

centenary

'hundredth anniversary' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for centenary that I've seen before include "special occasion" , "celebration" , "One hundredth anniversary" , "... so celebrating this next month" , "significant anniversary" .)

I've seen this clue in the Irish Times (Simplex), The Mirror, The Guardian, The Telegraph and The Times.

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