Assertion is when someone states or expresses their belief or opinion confidently and strongly. It is a way of asserting or declaring something to be true, without being afraid to make it known. Full definition
It's a «question of assertion of copyright over cases and codes,» and it's a «fundamental issue» that affects access to the law. (arstechnica.com)
He argues instead that a rational man must employ his own experience as a guide to the credibility of assertions about what he has not experienced. (religion-online.org)
Proof is required for those making assertions in the positive, not the negative. (religion.blogs.cnn.com)