Is there a term for a milestone number of days since an event, just as an anniversary is a milestone (in increments of years)?

I want to say “100 day-versary” or something like that.

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    In practice, anniversary is not necessarily measured in increments of years, despite its Latin meaning. High school sweethearts frequently celebrate their two-month anniversary (and then break up a week later because teenagers). I don’t think many people would bat even a single eyelash at “100-day anniversary”. Jan 24, 2018 at 17:26
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    Today I learned this appears to be a particularly Korean thing. However, misusing the term is so common that it appears that no alternative exists. Presumably it would be a dieversary, but because of how that word looks it's bound to be mispronounced and misunderstood.
    – Andrew Leach
    Jan 24, 2018 at 17:28
  • I don't think these are exact duplicates, but very relevant: Is there a term for an anniversary that falls on the same day of the week as its original date? and 1000 Day “Anniversary”. The OP of the second question liked "kiloversary" and "k-day"; you might like "centiversary" or "c-day" (or "hectoversary/h-day" if you shudder when you hear "C-note" meaning a hundred dollar bill rather than a penny).
    – 1006a
    Jan 24, 2018 at 17:44
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    Latin prefixes! If "Annus" is for year, then "Dies" (DEE-es) is for day. So . . . dieversary? Jan 24, 2018 at 18:42
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    @AndrewLeach For others’ sake, the “100-day anniversary” is a Korean thing, but not my intent. That was just an example on my part. My wife and I have been together 2048 days today, which is 2^11 days, or 10000000000 days in binary. I’m just a sentimental geek. :-)
    – jvriesem
    Jan 25, 2018 at 5:08


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