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“triennial” in Latin

The English word triennial itself goes back to Latin annus, through triennium.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

triennial
trietericus. A triennial feast (i. e., one celebrated every three years, trieterica (sacra), -orum, neuter; trieteris, -idis, feminine; triennia, -um, neuter (scilicet, sacra, Ov., Met., 9, 642, Bach.).

Quick answer

What is the Latin word for triennial?
The usual Latin words for “triennial” are trietericus, sacer, trĭĕtēris; also triennium, scīlicet. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.