Platinum anniversary (10)
I believe the answer is:
seventieth
(Other definitions for seventieth that I've seen before include "platinum to celebrate" , "Ordinal number" , "person's birthday" , "small fraction of whole" .)
I believe the answer is:
seventieth
(Other definitions for seventieth that I've seen before include "platinum to celebrate" , "Ordinal number" , "person's birthday" , "small fraction of whole" .)