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From Middle English assumpcioun, from Medieval Latin assumptio (a taking up (into heaven)) and Latin assumptio (a taking up, adoption, the minor proposition of a syllogism). Doublet of assumptio; see assume.


  • IPA(key): /əˈsʌm(p).ʃ(ə)n/[1][2][3]
  • (file)


assumption (countable and uncountable, plural assumptions)

  1. The act of assuming, or taking to or upon oneself; the act of taking up or adopting.
    His assumption of secretarial duties was timely.
  2. The act of taking for granted, or supposing a thing without proof; a supposition; an unwarrantable claim.
    Their assumption of his guilt disqualified them from jury duty.
  3. The thing supposed; a postulate, or proposition assumed; a supposition.
    • 1976, “The Journal of Aesthetic Education, Volume 10”, in (Please provide the book title or journal name)[1]:
      No doubt a finite evaluative argument must make some unargued evaluative assumptions, just as finite factual arguments must make some unargued factual assumptions.
  4. (logic) The minor or second proposition in a categorical syllogism.
  5. The taking of a person up into heaven.
    • 1528 October 12 (Gregorian calendar), Willyam Tyndale [i.e., William Tyndale], “Willyam Tyndale otherwyse Called Willyam Rychius vnto the Reader”, in The Obedience of [a] Christen Man, [], [London: [] Thomas Ranalde and Wyllyam Hyll, and are to be solde [] by Rychard Iugge []], published [1548], →OCLC, folio xx, recto:
      Of vvhat texte thou proueſt hell, vvyll another proue purgatory, another lymbo patrum, & another the aſſumpcion of our lady: & another ſhall proue of the ſame texte that an Ape hath atayle.
  6. A festival in honor of the ascent of the Virgin Mary into heaven, celebrated on 15 August.
  7. (rhetoric) Assumptio.


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Further reading[edit]


  1. ^ The Chambers Dictionary, 9th Ed., 2003
  2. ^ assumption”, in Lexico,; Oxford University Press, 2019–2022.
  3. ^ assumption”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.