Definition of "assumption"

assumption

/əˈsʌm(p).ʃ(ə)n/

noun
countable and uncountable, plural assumptions
1. The act of assuming, or taking to or upon oneself; the act of taking up or adopting.
2. The act of taking for granted, or supposing a thing without proof; a supposition; an unwarrantable claim.
3. The thing supposed; a postulate, or proposition assumed; a supposition.
  Quotations
  No doubt a finite evaluative argument must make some unargued evaluative assumptions, just as finite factual arguments must make some unargued factual assumptions.
  1976, “The Journal of Aesthetic Education, Volume 10”, in (Please provide the book title or journal name)‎
4. (logic) The minor or second proposition in a categorical syllogism.
5. The taking of a person up into heaven.
  Quotations
  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.
  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 , folio xx, recto
6. A festival in honor of the ascent of the Virgin Mary into heaven, celebrated on 15 August.
7. (rhetoric) Assumptio.