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Illustration of the deluge, from the nineteenth-century illustrated Bible of Gustave Doré


From ante- (before) +‎ Latin dīluvium (flood) +‎ -an; in reference to the story of Noah’s Ark (Genesis 6–9), an early episode in the Bible. By surface analysis, ante- +‎ diluvian.


  • (UK) IPA(key): /ˌan.tɪ.dɪˈluː.vɪən/
    • (file)
  • (General American) IPA(key): /ˌan.tə.dɪˈluː.vɪ.ən/, /ˌan.tə.dɪˈluː.vɪ.jɪn/


antediluvian (comparative more antediluvian, superlative most antediluvian)

  1. Ancient or antiquated.
    Synonyms: antediluvial, old, prehistoric; see also Thesaurus:old
  2. Extremely dated.
    Synonyms: dated, old-fashioned; see also Thesaurus:obsolete
    Those ideas are antediluvian.
    • 2021 December 3, “LGBTQ couples, families and marriage are ‘against the natural order,’ Thai Constitutional Court rules”, in Coconuts Bangkok[1], Bangkok: Coconuts Media Limited, retrieved 2021-12-03:
      Portions of the ruling reflected the court’s culturally conservative roots, stating that because marriage is only for reproduction, LGBTQ relationships are unnatural because they cannot produce children. [] The ruling continued in its surprisingly antediluvian rationale, invalidating untold numbers of nontraditional families.
    • 2010, Sam Chaltain, American Schools: The Art of Creating a Democratic Learning Community, Lanham, MD: Rowman & Littlefield Education, →ISBN, page 41:
      If we agree with Blinder's assessment, we must acknowledge the pressing need to inject new ideas into an old system – a system so antediluvian that it is, remarkably, still based on the agrarian calendar.
  3. Pertaining or belonging to the time period prior to a great or destructive flood or deluge.
    Synonym: preflood
  4. (biblical) Pertaining or belonging to the time prior to Noah's Flood.
    Synonyms: antediluvial, prediluvian
    Coordinate term: prelapsarian


The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.


antediluvian (plural antediluvians)

  1. One who lived prior to Noah's Flood.
    Synonym: prediluvian
    • 1828, James Hogg, The Brownie of the Black Haggs:
      He was a boy in form, and an antediluvian in feature.

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Borrowed from French antédiluvien.


antediluvian n (plural antediluvieni)

  1. antediluvian