tricennial

From Latin trīcennium (“30-year period”) + -al, from trīcennis (“30-year”) + -ium, from trīciēs (“30 times”) + annus (“year”) + -is. Compare Latin tricennalis. Equivalent to tri- +‎ decennial. Doublet of tricennal.

tricennial (not comparable)

1. Of, related to, lasting, or occurring once every thirty years.
2. (historical) Of or related to a tricennalia, the celebrations marking the 30th year of a Roman emperor's rule.
   • 1977, T.D. Barnes, “Two Speeches by Eusebius”, in Greek, Roman, and Byzantine Studies, number 18, page 341:

     Some manuscripts of Eusebius' Life of Constantine contain not only the four books of the Life and Constantine's Speech to the Assembly of the Saints but also two speeches which are conventionally known by a single title as Laus Constantini, Laudes Constantini, De laudibus Constantini, or the "Tricennial Oration," and which all editors of Eusebius so far have published as a single work.

   • 1997, Patrick Bruun, “The Victorious Signs of Constantine: A Reappraisal”, in Numismatic Chronicle, volume 157, page 53:

     (vi) The employment of Constantine's high-crested helmet in the gold coinage of Constantius in his tricennial issues...

• trigintennial

• “tricennial”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

• calretinin, encrinital, nitracline