Word for three times a year. Is tri-quarterly a real word? Or possibly three times a quarter, which is monthly You can't redefine a quarter as a third, though Three times a year is triannual — not triennial which is every three years You could also say every four months; "every four months" is preferable because it removes the possibility of confusion between triennial and triannual
Three-times vs three times - English Language Usage Stack Exchange Three times as many cases of measles were reported in the United States in 2014 vs Three-times as many cases of measles were reported in the United States in 2014 Is there a difference between the normal and hyphenated versions? Which one is correct?