English edit

Alternative forms edit

Etymology edit

From Latin quīnquennium, from quinquennis (5-year) + -ium (forming abstract nouns).

Pronunciation edit

Noun edit

quinquennium (plural quinquenniums or quinquennia)

  1. A period of five years.
    Coordinate terms: annum, biennium, triennium, quadrennium, sexennium, septennium, octennium, novennium, decennium, vicennium, tricennium, centennium, quincentennium, millennium, decamillennium, centimillennium, millionennium
    During the quinquennium from 1991 to 1995, infant mortality increased.

Usage notes edit

The Roman usage of the term counted inclusively so that quinquennia were 4 year cycles. This is not usually intended in English but may occur in translations of classical texts.

Pentad or the neologism quintade are sometimes used when one wishes to specify the first and second halves of calendrical decades. Lustrum and luster are particularly used for the 5 year periods of the Roman censuses, after the purification ritual that usually followed the count.

Synonyms edit

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Related terms edit

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References edit

Latin edit

Pronunciation edit

Etymology 1 edit

Adjective edit


  1. genitive masculine/feminine/neuter plural of quīnquennis

Etymology 2 edit

From quīnquennis (5-year) +‎ -ium (-ium: forming abstract nouns), from quīnque (five) + annus (year) + -is (forming compound adjs).

Noun edit

quīnquennium n (genitive quīnquenniī or quīnquennī); second declension

  1. A period of five years.
  2. A five-year term of office.
Declension edit

Second-declension noun (neuter).

Case Singular Plural
Nominative quīnquennium quīnquennia
Genitive quīnquenniī
Dative quīnquenniō quīnquenniīs
Accusative quīnquennium quīnquennia
Ablative quīnquenniō quīnquenniīs
Vocative quīnquennium quīnquennia

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

Derived terms edit

References edit

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