space of three years or a triennial festival
Latin word, found 11 times in the texts on Socratos.
Cicero, De Natura Deorum 3.58: … sunt instituta, quartum Iove et Luna, cui sacra Orphica putantur confici, quintum Nyso natum et Thyone, a quo trieterides constitutae putantur.
Martial, Epigrammata 6.38.1: Aspicis, ut parvus nec adhuc trieteride plena
Statius, Thebais 4.722: ludus et atra sacrum recolet trieteris Ophelten.
All forms of trieteris