Assertion

Noun

 * 1) The act of asserting, or that which is asserted; positive declaration or averment; affirmation; statement asserted; position advanced.
 * 2) Maintenance; vindication; as, the assertion of one's rights or prerogatives.
 * 3)  A statement in a program asserting a condition expected to be true at a particular point, used in debugging.

Adjectives for Assertion
ignorant; lofty; vigorous; hare-brained; aggressive; emphatic; blundering; boastful; truculent; reiterated; extravagant; prior; impudent; audacious; wild; bland; complete; incredible; dogmatic; complimentary; intense; loud; incensed; controversial; irresponsible; sweeping; absolute; stalwart; astounding; autocratic;  despotic; arbitrary; brutal;  blustering; erroneous; Pharisaical;  fallacious; monstrous; disputable; contradictory; vainglorious; random; groundless;florid; deliberate; colorful; presumptuous; unequivocal; gratuitous.

Verbs for Assertion
affirm—; aver—; conclude—; contest—;contradict—; controvert—; credit—; declare —; defend—; flinch under—; justify—;maintain—; protest—; prove—; qualify—;refute—; sponsor—; support—; —contradicts; —elicits from; —liberates; —persuades; —sets free; —vindicates.

Thesaurus
a priori principle; address; admission; affidavit; affirmance; affirmation; allegation; announcement; annunciation; answer; apostrophe; apriorism; asseveration; assumed position; assumption; attest; attestation; averment; avouchment; avowal; axiom; basis; categorical proposition; comment; compurgation; conclusion; confirmation; contention; crack; creed; data; declaration; deposition; dictum; disclosure; enunciation; exclamation; expression; first principles; foundation; greeting; ground; hypothesis; hypothesis ad hoc; insistence; instrument in proof; interjection; ipse dixit; legal evidence; lemma; major premise; manifesto; mention; minor premise; note; observation; philosopheme; philosophical proposition; phrase; position; position paper; positive declaration; postulate; postulation; postulatum; predicate; predication; premise; presupposition; proclamation; profession; pronouncement; proposition; propositional function; protest; protestation; question; reflection; remark; representation; say; say-so; saying; sentence; stance; stand; statement; subjoinder; sumption; supposal; sworn evidence; sworn statement; sworn testimony; testimonial; testimonium; testimony; theorem; thesis; thought; truth table; truth-function; truth-value; utterance; vouch; witness; word