Chris Ambidge wrote to report a mailing from the San Francisco LGBT Community Center, celebrating its ten-year anniversary; on-line story here. Chris would have said tenth anniversary, and found ten-year anniversary redundant (like PIN number, he said), because ‘year’ is already contained in anniversary. This is one of two complaints about the usage of anniversary: the perceived pleonasm of n-year anniversary. The other complaint is about the perceived contradiction in n-span anniversary for spans other than year, especially month (one-month anniversary, six-month anniversary, six-week anniversary) — again, because ‘year’ is contained in anniversary. The second complaint seems to be the older one; it’s the only one reported in MWDEU (in 1989).
The second innovation presumably arose from a weakening appreciation of the etymology of anniversary, so that the word can be extended to recurring spans of time other than a year (though the default span of time was still a year). Then people began supplying year, for clarity, giving us things like ten-year anniversary, as distinct from ten-month anniversary and ten-week anniversary.
And the complaints piled up.
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