vicennis

Latin

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

vīcennis (neuter vīcenne); third-declension two-termination adjective (post-classical)

celebrated or occuring every twenty years, vicennial
of twenty years, lasting twenty years
twenty-year-old
- 6th century AD, Angelramnus Metensis, Collectio Canonum Regulae Ancyrani concilii numero XXIV priores quidem sunt Nicaenis: sed ideo Nicaenis istae postponuntur, propter sancti et magni concilii auctoritatem Nicaeae congregati..XV:
  Nondum vicennes, post XV annos in poenitentia exactos, orationum communionem recipiant. Deinde post quinquennium communionem altaris percipiant. Quibus etiam prolixius tempus ad agendam poenitentiam imponendum est, si tale scelus frequentaverint. Qui autem jam vicennarii et uxorati ita peccaverint, XXVI annis poenitentia exactis tandem in oratione communicent, deinde post quinquennium oblationis sacramenta percipiant. Qui vero quinquagenarii et uxorati ita peccaverunt, tandem ad exitum vitae communionem recipiant.
  (please add an English translation of this quotation)

Third-declension two-termination adjective.

	masc./fem.	neuter	masc./fem.	neuter
	singular		plural
nominative	vīcennis	vīcenne	vīcennēs	vīcennia
genitive	vīcennis		vīcennium
dative	vīcennī		vīcennibus
accusative	vīcennem	vīcenne	vīcennīs vīcennēs	vīcennia
ablative	vīcennī		vīcennibus
vocative	vīcennis	vīcenne	vīcennēs	vīcennia

vicennis, in ΛΟΓΕΙΟΝ [Logeion] Dictionaries for Ancient Greek and Latin (in English, French, Spanish, German, Dutch and Chinese), University of Chicago, since 2011
“vicennis”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.