something taken for granted; a supposition:
a correct assumption.
Synonyms: presupposition; hypothesis, conjecture, guess, postulate, theory.
the act of taking for granted or supposing.
Synonyms: presumption; presupposition.
the act of taking to or upon oneself.
Synonyms: acceptance, shouldering.
the act of taking possession of something:
the assumption of power.
Synonyms: seizure, appropriation, usurpation, arrogation.
arrogance; presumption.
Synonyms: presumptuousness; effrontery, forwardness, gall.
the taking over of another’s debts or obligations.

(often initial capital letter) the bodily taking up into heaven of the Virgin Mary.
(initial capital letter) a feast commemorating this, celebrated on August 15.

Logic. the minor premise of a .
Contemporary Examples

The Valley has been quite honest about its assumptions, and unions should be honest about theirs.
Bay Area Subway Strike Re-Ignites the Feud Between Unions and Silicon Valley Gregory Ferenstein July 13, 2013

And before you jump to assumptions, know that I’m no hippie.
A Navy Vet’s Case for Gun Control Shawn VanDiver November 22, 2014

Under that logic, any plan that dictated a set of favorable outcomes would score well, as long as the assumptions proved true.
Ryan Budget Plan Sounds Good But Lacks Substance Zachary Karabell August 12, 2012

Douthat’s program proceeds from two assumptions and is based on six principles.
Inter-Galactic Reform Conservatism Michael Tomasky May 30, 2013

A conservative dominated media wouldn’t be any better about policing its own assumptions.
More Fact Checker Fail Megan McArdle October 18, 2012

Historical Examples

These assumptions do away with any real admission of miracles even on religious grounds.
History of Rationalism Embracing a Survey of the Present State of Protestant Theology John F. Hurst

It is possible I may be wrong in either or both of these assumptions.
Sir Brook Fossbrooke, Volume I. Charles James Lever

It is only in the case of woman that the obvious conclusion is passed over for assumptions that cannot be proved.
The Truth About Woman C. Gasquoine Hartley

Miss Haldin thought it useless to protest against all these assumptions.
Under Western Eyes Joseph Conrad

Even the most rigorous Catholics were alarmed at his assumptions, and the pope was humiliated by his haughty bearing.
The Empire of Austria; Its Rise and Present Power John S. C. Abbott

the act of taking something for granted or something that is taken for granted
an assuming of power or possession of something
arrogance; presumption
(logic) a statement that is used as the premise of a particular argument but may not be otherwise accepted Compare axiom (sense 4)
noun (Christianity)
the taking up of the Virgin Mary (body and soul) into heaven when her earthly life was ended
the feast commemorating this, celebrated by Roman Catholics on Aug 15

c.1300, “the reception, uncorrupted, of the Virgin Mary into Heaven,” also the Church festival (Aug. 15) commemorating this, Feast of the Assumption, from Old French assumpcion and directly from Latin assumptionem (nominative assumptio) “a taking, receiving,” noun of action from past participle stem of assumere (see assume). Meaning “minor premise of a syllogism” is late 14c. Meaning “appropriation of a right or possession” is mid-15c. Meaning “action of taking for oneself” is recorded from 1580s; that of “something taken for granted” is from 1620s.

Read Also:

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