Learn English – is there a word to represent once every nine months


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.

Best Answer

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