Word for "3 times per year"?

Is there a word that means 3 times per year? (I am trying to find the right term for the 3 times/year review meetings we hold.)

We all know semiannually is 2/year, quarterly is 4/year, but 3/year???

I've seen quadmonthly used; isn't there a better term based on a latin prefix that means "one-third"? (I thought maybe something related to tertiary, but that relates to being 3rd, not one-third.)

Craig in NJ