vicennalis

From vīcennis (“20-year”) +‎ -ālis (“-al: forming adjectives”), from vīciēs (“twenty each”) + annus (“year”) + -is (“forming compound adjs”). Equivalent to vīciēs + annālis (“of or related to a year”).

• (Classical) IPA^(key): /u̯iː.kenˈnaː.lis/, [u̯iːkɛnˈnäːlʲɪs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /vi.t͡ʃenˈna.lis/, [vit͡ʃenˈnäːlis]

vīcennālis (neuter vīcennāle); third-declension two-termination adjective

1. vicennial, of or related to a 20-year period

Third-declension two-termination adjective.

• annālis, quīnquennālis, decennālis

• English: vicennals
• Italian: vicennale