What is the accepted word for three times a year and once in three years?
like biannual and biennial for twice a year and once in two years

Thanks

Question

What is the accepted word for three times a year and once in three years?
like biannual and biennial for twice a year and once in two years

Thanks

Answer

You could use triannual (3 times a year) and triennial (every 3 years).  However, it is more common to use phrases like "once every 4 months" and "once every 3 years" as the words sound almost alike but the phrases are very clear.

Answer

In three month intervals = Quarterly

Answer

True: it is technically possible to continue using the latin numbers (tri-, quad-, quint-, sex/hex-, sept-) for such examples, but in most cases you wouldn't use it for more than 2 or 3 times.  It sounds too clumsy if you continue the pattern 'ad nauseam'.