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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.
Ecclesiastical.

(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

Both the gap in solutions and the assumption of outcomes undermine this argument.
Why The PA Shouldn’t Be Dissolved Brent E. Sasley March 3, 2013

It hinges on the assumption that the Vatican or its metaphysical emanation, the Holy See, is a state.
Prosecute the Pope Geoffrey Robertson March 31, 2010

This assumption, by and large, was a fair one, justified by our particular experience.
Mosul’s Civilization and Its Discontents Michael Carson June 13, 2014

An interest in fashion also seems to beget an assumption of selfishness and mean-spiritedness.
Michelle Obama and Ann Romney: First Ladies of Style Robin Givhan October 23, 2012

The assumption is that he will make good on the wink, just as blacks made good on the nod by supporting him in record numbers.
What Has Obama Cost Blacks? A Columbia Professor Asks Hard Questions Mansfield Frazier July 14, 2012

Historical Examples

And I felt that here again the assumption was an untrue one.
At Large Arthur Christopher Benson

With the assumption that I might be within hearing, De Boer tried to trap me.
Astounding Stories of Super-Science September 1930 Various

There is an assumption of superiority, and often a manifestation of contempt.
What is Darwinism? Charles Hodge

Such an assumption is based on false conception of the psychology of suggestion.
The Sexual Question August Forel

He had been stunned by the shock and his active imagination had at once accepted the assumption that he had been wounded.
The Fighting Edge William MacLeod Raine

noun
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
n.

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.