vicennium

From Latin vicennium, from vīcennis (“20-year”) + -ium, from vīciēs (“20 times”) + annus (“year”) + -is (“forming compound adjectives”). Equivalent to vicennial +‎ -ium.

vicennium (plural vicennia or vicenniums)

1. (rare) A period of twenty years.

• annum (1 year), biennium (2), triennium (3), quadrennium (4), quinquennium (5), sexennium (6), septennium (7), octennium (8), novennium (9), decennium (10), tricennium (30), centennium (100), quincentennium (500), millennium (1000), decamillennium (10,000), centimillennium (100,000), millionennium (1,000,000)

• (Classical) IPA^(key): /u̯iˈken.ni.um/, [u̯ɪˈkɛnːiʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /viˈt͡ʃen.ni.um/, [viˈt͡ʃɛnːium]

From vīcennis (“20-year”) +‎ -ium (“-ium: forming abstract nouns”), from vīciēs (“20 times”) + annus (“year”) + -is (“forming compound adjectives”).

vīcennium n (genitive vīcenniī or vīcennī); second declension

1. vicennium, a 20-year period

Second-declension noun (neuter).

¹Found in older Latin (until the Augustan Age).

• English: vicennium
• Italian: vicennio

vīcennium

1. genitive masculine/feminine/neuter plural of vīcennis

• “vicennium”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• vicennium in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.