is there a single word to represent "once every nine months"? Since 9 months is a fraction larger than half a year, semi-annualy seems wrong.
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1You could always try tri-trimesterally. What's the real-world context where you might need such a term?– FumbleFingersCommented Jul 15, 2014 at 19:09
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Semi-annual (or biannual) is certainly wrong. I think you need to coin something. I like FumbleFingers' tri-trimesteral, but would add two more possibilities, nonamesteral and sesquibiannual.– RupeCommented Jul 15, 2014 at 19:14
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11If you want something that people will actually understand, you can stick with "9-month period". Anything else could be confusing, IMO. (FumbleFingers Tri-Tri... sounds a lot like stuttering to me! lol!)– Kristina LopezCommented Jul 15, 2014 at 19:22
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1@KristinaLopez That is a fair point, although for the frequency the OP is looking for they'd still have to put something like their "once every" before it.– RupeCommented Jul 15, 2014 at 19:29
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1every three quarters in economics; quarterly; bi-annually, every three quarters or every third quarter;– LambieCommented Feb 4, 2017 at 17:38
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2 Answers
Perhaps consider dodranial or perhaps dodrantal, formed from the Latin dodrans. Of dodrans, Wikipedia says:
The Latin word literally means nine-twelfths, and can refer to a time span of forty-five minutes or a length of nine inches.
Note, ignore the claim at languagehat/dodrans that dodrans means 2/3; a comment later in the page substantiates that dodrans is 3/4, while bes is 2/3. Also, phrontistery has an OED-based entry for dodrantal:
adj 1656-1883 of nine inches in length
answered Jul 15, 2014 at 20:07
trimester = trimestris = tres + mensis = 3 months
semester = semestris = sex + mensis = 6 months
So wouldn't it be nomester = nomestris = novem + mensis = 9 months
