sexennium - Wiktionary, the free dictionary

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From Latin sexennium, from sexennis (“6-year”) + -ium (suffix forming abstract nouns).

(General American) IPA^(key): /sɛkˈsɛniəm/
(Received Pronunciation) IPA^(key): /sɛkˈsɛnɪəm/

sexennium (plural sexenniums or sexennia)

A period of six years.
Coordinate terms: annum, biennium, triennium, quadrennium, quinquennium, septennium, octennium, novennium, decennium, vicennium, tricennium, centennium, quincentennium, millennium, decamillennium, centimillennium, millionennium

sexennate

See sextet

(adj.) sexennial

“sexennium, n.”, in OED Online ⁠, Oxford, Oxfordshire: Oxford University Press, 2022.

From sexennis (“of six years”).

(Classical Latin) IPA^(key): /sekˈsen.ni.um/, [s̠ɛkˈs̠ɛnːiʊ̃ˑ]
(modern Italianate Ecclesiastical) IPA^(key): /sekˈsen.ni.um/, [seɡˈzɛnːium]

sexennium n (genitive sexenniī or sexennī); second declension

A period or span of six years.

Second-declension noun (neuter).

Case	Singular	Plural
Nominative	sexennium	sexennia
Genitive	sexenniī sexennī¹	sexenniōrum
Dative	sexenniō	sexenniīs
Accusative	sexennium	sexennia
Ablative	sexenniō	sexenniīs
Vocative	sexennium	sexennia

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

(adjective): sexennālis
(2-year period): biennium
(3-year period): triennium
(4-year period): quadrennium
(5-year period): quīnquennium
(7-year period): septennium

→ Catalan: sexenni
→ English: sexennium
→ Italian: sessennio
→ Spanish: sexenio

“sexennium”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
“sexennium”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
sexennium in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.