tricennium

From Latin trīcennium, from trīcennis (“30-year”) + -ium, from trīciēs (“[30]] times”) + annus (“year”) + -is (“forming compound adjectives”). Equivalent to tricennial +‎ -ium.

tricennium (plural tricennia or tricenniums)

1. (rare) A period of thirty years.
   • 1979, Thomas J. Dunlap, transl. Herwig Wolfram as History of the Goths, p. 298:

     As early as the second decade after his entry into Italy Theodoric made all illegal or irregular acquisitions that had taken place prior to this fixed date [28 August 489] subject to the thirty-year statue of limitation (tricennium).

   • 2021, Gavin Lucas, Making Time, page 48:

     With a site I have been working with in Iceland, I am dealing with 30-year time units or tricennia, and even if it is no Pompeii, there are still features that we know represented much shorter time scales—the construction of a fireplace that could have been accomplished in a day, the placing of a coin under a timber sill beam that only took a few seconds.

• annum (1 year), biennium (2), triennium (3), quadrennium (4), quinquennium (5), sexennium (6), septennium (7), octennium (8), novennium (9), decennium (10), vicennium (20), centennium (100), quincentennium (500), millennium (1000), decamillennium (10,000), centimillennium (100,000), millionennium (1,000,000)

• (Classical Latin) IPA^(key): [triːˈkɛn.ni.ũː]
• (modern Italianate Ecclesiastical) IPA^(key): [t̪riˈt͡ʃɛn.ni.um]

From trīcennis (“30-year”) +‎ -ium (“-ium: forming abstract nouns”), from trīciēs (“30 times”) + annus (“year”) + -is (“forming compound adjectives”).

trīcennium n (genitive trīcenniī or trīcennī); second declension

1. tricennium, a 30-year period

Second-declension noun (neuter).

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

• English: tricennium

trīcennium

1. genitive masculine/feminine/neuter plural of trīcennis

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