from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Behavior or attitude that is boldly arrogant or offensive; effrontery.
  • n. The act of presuming or accepting as true.
  • n. Acceptance or belief based on reasonable evidence; assumption or supposition.
  • n. A condition or basis for accepting or presuming.
  • n. Law A conclusion derived from a particular set of facts based on law, rather than probable reasoning.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the act of presuming, or something presumed
  • n. the belief of something based upon reasonable evidence, or upon something known to be true
  • n. the condition upon which something is presumed
  • n. arrogant behaviour

from the GNU version of the Collaborative International Dictionary of English

  • n. The act of presuming, or believing upon probable evidence; the act of assuming or taking for granted; belief upon incomplete proof.
  • n. Ground for presuming; evidence probable, but not conclusive; strong probability; reasonable supposition.
  • n. That which is presumed or assumed; that which is supposed or believed to be real or true, on evidence that is probable but not conclusive.
  • n. The act of venturing beyond due beyond due bounds; an overstepping of the bounds of reverence, respect, or courtesy; forward, overconfident, or arrogant opinion or conduct; presumptuousness; arrogance; effrontery.

from The Century Dictionary and Cyclopedia

  • n. The act of presuming, or taking upon one's self more than good sense and propriety warrant; excessive boldness or over-confidence in thought or conduct; presumptuousness; assurance; arrogance.
  • n. The act of presuming or probably inferring; hypothetical or inductive inference.
  • n. That which is presumed; that which is supposed to be true upon grounds of probability.
  • n. A ground for presuming or believing; evidence or probability, as tending to establish an opinion.
  • n. In law, an inference as to the existence of one fact from the existence of some other fact, founded upon a previous experience of their connection, or dictated by the policy of the law.
  • n. Surmise, Conjecture, etc. See inference.
  • n. Likelihood, probability.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an assumption that is taken for granted
  • n. a kind of discourtesy in the form of an act of presuming
  • n. audacious (even arrogant) behavior that you have no right to
  • n. (law) an inference of the truth of a fact from other facts proved or admitted or judicially noticed


Middle English presumpcion, from Old French, from Late Latin praesūmptiō, praesūmptiōn-, from Latin, anticipation, from praesūmptus, past participle of praesūmere, to anticipate; see presume.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Late Latin praesumptionem, accusative singular of praesumptio. (Wiktionary)



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