the act of presuming.
assumption of something as true.
belief on reasonable grounds or probable evidence.
something that is presumed; an assumption.
a ground or reason for presuming or believing.
Law. an inference required or permitted by law as to the existence of one fact from proof of the existence of other facts.
an assumption, often not fully established, that is taken for granted in some piece of reasoning.
unwarrantable, unbecoming, or impertinent boldness.

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

overpresumption, noun

assumption, axiom, premise, presumption.

8. audacity, effrontery, arrogance, gall. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
presumption (prɪˈzʌmpʃən)
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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Word Origin & History

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 of innocence has nothing to do with any of the above.
Current conversations about resurrecting the gold standard should focus on this
  underlying presumption of the standard.
Recognize that the presumption of innocence is there for a good reason and let
  the legal process take its course.
The presumption has been that smoking renders people vulnerable to disease by
  impairing lung function or immunity.
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