An assertion is a declaration that's made emphatically, especially as part of an argument or as if it's to be understood as a statement of fact.

To assert is to state with force. So if someone makes an assertion, they’re not just trying out an idea — they really mean it. An assertion can also be an act that seems to make a statement without words. When your dog urinates in multiple places up and down your block, he's making an assertion of his dominance (also called "marking") over his "territory."

Definitions of assertion
  1. noun
    a declaration that is made emphatically (as if no supporting evidence were necessary)
    synonyms: asseveration, averment
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    an assertion of a right (as to money or property)
    an assertion that something is true or factual
    accusation, charge
    an assertion that someone is guilty of a fault or offence
    a point asserted as part of an argument
    ipse dixit, ipsedixitism
    an unsupported dogmatic assertion
    affirmation, avouchment, avowal
    a statement asserting the existence or the truth of something
    an assertion offering firsthand authentication of a fact
    denial, disaffirmation
    the act of asserting that something alleged is not true
    cause of action
    a claim sufficient to demand judicial attention; the facts that give rise to right of action
    a claim of rights
    the advancing of a claim
    a charge brought by an accused person against the accuser
    allegation, allegement
    statements affirming or denying certain matters of fact that you are prepared to prove
    (law) a contention presented by a lawyer to a judge or jury as part of the case he is arguing
    reaffirmation, reassertion
    renewed affirmation
    professing, profession
    an open avowal (true or false) of some belief or opinion
    a reply of affirmation
    the speech act of negating
    type of:
    a statement that is emphatic and explicit (spoken or written)
  2. noun
    the act of affirming or asserting or stating something
    synonyms: affirmation, statement
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    one chap's arbitrary assertion
    type of:
    speech act
    the use of language to perform some act
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