tricennis

From trīciēs (“thirty times”) +‎ annus (“year”) +‎ -is (“forming compound adjectives”).

• (Classical Latin) IPA^(key): [triːˈkɛn.nɪs]
• (modern Italianate Ecclesiastical) IPA^(key): [t̪riˈt͡ʃɛn.nis]

trīcennis (neuter trīcenne); third-declension two-termination adjective

1. tricennial, of or related to a 30-year period, lasting 30 years, 30 years old.

Third-declension two-termination adjective.

• biennis, triennis, quadriennis, quinquennis, sexennis, septuennis, octennis, novennis, decennis, undecennis, duodecennis, tridecennis, quattuordecennis, quindecennis, sedecennis, septendecennis, duodevicennis, undevicennis, vicennis, quadragennis, quinquagennis, sexagennis, septuagennis, octogennis, nonagennis, centennis, ducentennis, trecentennis, quadringentennis, quingentennis, sescentennis, septingentennis, octingentennis, nongentennis, millennis

• tricennium

• "tricennis" in Francesco Arnaldi & al. (1964), Latinitatis Italicae Medii Aevi... Lexicon Imperfectum, Vol. IV