To defend one's rights or opinions, sometimes with unnecessary zeal; to thrust oneself forward.

The state of being self-assertive

(logic) Stating that which is actual.

One who asserts or avers. / One who supports, affirms, defends, or vindicates; a champion.

plural of assertor

In an assertoric fashion.

According to an assertion.

Asserting that a thing is.

Affirming; maintaining.

In a way that uses or relates to assertion.