If something happens once every six months, or has six months' duration - and lots of things do, like solstices, or half-yearly detox programs, or dental appointments, as recommended by dentists - then it deserves a word, and if that word isn't going to be a ye olde "six-monthly", if it's going to get all Latinate on our glottises, then it should comprise sex (Latin for six), menses (Latin for months), and whatever suffix mutation you fancy to indicate that the word is functioning as an adjective. By my reckoning, that gives us "sexmensual". Instead, what do we get? We get "semesterly", which is a coy, anodyne, weak, corrupt, inferior and altogether bogus substitute, with no x. X, I might as well point out here, is the letter of Our Lord, and also of an esteemed Brisvegan brewery, and deserves better than to be elided into non-existence. Henceforth, I will refuse to speak of "semesters". I will speak of "sexmenses". And I will refuse to say "semesterly". I will say "sexmensual". Or "sexmestrial", if I'm feeling jaunty.