triennia

triennia ium, n

tres+annus; sc. sacra, a festival held every three years, triennial festival .

triennia
trĭennĭa, ĭum, n. (sc. sacra) [triennium], a festival celebrated every three years , a triennial fe...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.