‘It’s like Pin number,’ said my husband, drifting into lucidity.
So it is, in a way. The construction under discussion was one-year anniversary. Just as Pin embraces personal identification number (making the addition of number pleonastic), so the concept of a year is plain in anniversary, rendering the cobbling on of year redundant.
I am sorry to say there is bad news for all of us who think one-year anniversary and its family repugnant.

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