pre·sump·tion

[pri-zuhmp-shuhn]
noun
1.
the act of presuming.
2.
assumption of something as true.
3.
belief on reasonable grounds or probable evidence.
4.
something that is presumed; an assumption.
5.
a ground or reason for presuming or believing.
6.
Law. an inference required or permitted by law as to the existence of one fact from proof of the existence of other facts.
7.
an assumption, often not fully established, that is taken for granted in some piece of reasoning.
8.
unwarrantable, unbecoming, or impertinent boldness.
Origin:
1175–1225; Middle English: effrontery, supposition < Latin praesūmptiōn- (stem of praesūmptiō) anticipation, supposition, Late Latin: presumptuousness, equivalent to praesūmpt(us) (past participle of praesūmere to undertake beforehand; see presume) + -iōn- -ion

Related forms
o·ver·pre·sump·tion, noun

Can be confused: assumption, axiom, premise, presumption.

Synonyms
8. audacity, effrontery, arrogance, gall.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
presumption (prɪˈzʌmpʃən) [Click for IPA pronunciation guide]
 
—n
1.  the act of presuming
2.  bold or insolent behaviour or manners
3.  a belief or assumption based on reasonable evidence
4.  a ground or basis on which to presume
5.  law an inference of the truth of a fact from other facts proved, admitted, or judicially noticed
 
[C13: via Old French from Latin praesumptiō a using in advance, anticipation, from praesūmere to take beforehand; see presume]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

presumption
early 13c., "seizure and occupation without right," also "taking upon oneself more than is warranted," from L.L. praesumptionem "confidence, audacity," in classical L., "a taking for granted, anticipation," from praesumere "to take beforehand," from prae "before" + sumere "to take." In English, the
meaning "the taking of something for granted" is attested from c.1300. Presumptuous preserves the original sense.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The presumption that coral reefs are dying due to warming has not been
  determined as factual.
Your presumption is quite preposterous and it scares me that there are people
  who think this way.
The presumption has been that smoking renders people vulnerable to disease by
  impairing lung function or immunity.
The presumption that nobody would think to turn off a computer or game console
  they're not using is frankly out of touch.
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