sempiternity

sem·pi·ter·ni·ty
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UK/ˌsɛmpɪˈtɜːnəti/US/ˌsɛmpɪˈtɝnəti/

noun

Existence within time but infinitely into the future, as opposed to eternity, understood as existence outside time.

Similar
perpetuity
OriginLatin sempiternitas →
Scrabble 19
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Meanings

nounsempiternity (uncountable)
  1. uncountablehuman sciencesExistence within time but infinitely into the future, as opposed to eternity, understood as existence outside time.
  2. literaryuncountableEternity; a seemingly everlasting period of time.

Synonyms & antonyms

nounthe property of being perpetual (seemingly ceaseless)

Similar
perpetuity
Broader
permanencepermanency
Also see
perpetuity

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Latinsempiternitas
  2. Englishsempiternity

From sempitern(al) + -ity, from Latin sempiternitas.

More words from Latin

Full word history & related roots →
Cite this entry
APA

sempiternity. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/sempiternity

MLA

“sempiternity.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/sempiternity. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “sempiternity,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/sempiternity.

Source: sempiternity on Wiktionary, CC BY-SA 4.0.