assertion Meaning, Definition & Usage

  1. noun a declaration that is made emphatically (as if no supporting evidence were necessary)
    averment; asseveration.
  2. noun the act of affirming or asserting or stating something
    affirmation; statement.

WordNet

As*ser"tion noun
Etymology
L. assertio, fr. asserere.
Definitions
  1. The act of asserting, or that which is asserted; positive declaration or averment; affirmation; statement asserted; position advanced.
    There is a difference between assertion and demonstration. Macaulay.
  2. Maintenance; vindication; as, the assertion of one's rights or prerogatives.

Webster 1913