What does vīcennis mean in Latin?

vīcennis, a adjective, means “celebrated or occuring every twenty years, vicennial; of twenty years, lasting twenty years; twenty-year-old”.

How do you pronounce vīcennis?

In classical Latin, [wiːˈkɛn.nɪs]; in ecclesiastical (church) Latin, [viˈt͡ʃɛn.nis].

adjectivethird-declension two-termination adjective

vīcennis (neuter vīcenne)

Classical[wiːˈkɛn.nɪs]Ecclesiastical[viˈt͡ʃɛn.nis]

singular
form	masculine	feminine	neuter
nominative	vīcennis	vīcennis	vīcenne
genitive	vīcennis	vīcennis	vīcennis
dative	vīcennī	vīcennī	vīcennī
accusative	vīcennem	vīcennem	vīcenne
ablative	vīcennī	vīcennī	vīcennī
vocative	vīcennis	vīcennis	vīcenne

plural
form	masculine	feminine	neuter
nominative	vīcennēs	vīcennēs	vīcennia
genitive	vīcennium	vīcennium	vīcennium
dative	vīcennibus	vīcennibus	vīcennibus
accusative	vīcennīs vīcennēs	vīcennīs vīcennēs	vīcennia
ablative	vīcennibus	vīcennibus	vīcennibus
vocative	vīcennēs	vīcennēs	vīcennia

From vīc- (“twenty”) + annus (“year”) + -is (forming compound adjectives).