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I have a document with the headings: daily, weekly, monthly, yearly, and decadely. Google Chrome, Google Docs, and Dictionary.com insist that "decadely" is not a word. Furthermore, deacadely sounds and looks weird to me.

Is there a word I am unaware of which captures this meaning?

What would you call something that happens each century or each millennium?

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On the other end of the spectrum, "hourly" is fine, but "minutely" and "secondly" have an unrelated meaning. –  dbkk Dec 27 '10 at 12:04
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up vote 21 down vote accepted

I would just use "per decade" and "per century", but the words you're looking for are decennially (as in "the census is done decennially") and centennially (and millennially). See Wikipedia: Anniversary for more words.

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Awesome! I didn't think to search for "Anniversary," I was so focused on frequency. As far as "per X" goes, I wanted consistency in my headings and I don't really like the aesthetic of "Per Day," it seems really unnatural. –  Dan King Dec 27 '10 at 3:28
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Decennially,Centennially, and Millennially are probably the words you're looking for....

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