D defs.my
Entry 2 senses Webster, 1913

Assertion

/əs-ẽrsh'-ən/ · As·ser·tion · IPA /əˈsɜɹʃən/
01 n. The act of asserting, or that which is asserted; positive declaration or averment; affirmation; statement asserted; position advanced.
  1. 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. 2.
    Maintenance; vindication; as, the assertion of one's rights or prerogatives.