As*ser"tion (#), n. [L. assertio, fr. asserere.]
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.