Etymology
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asseveration (n.)

"an emphatic assertion," 1550s, from Latin asseverationem (nominative asseveratio) "vehement assertion, protestation," noun of action from past-participle stem of asseverare/adseverare "affirm, insist on," from ad "to" (see ad-) + severus "serious, grave, strict, austere," which is probably from PIE root *segh- "to have, hold," on the notion of "steadfastness, toughness."

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Definitions of asseveration

asseveration (n.)
a declaration that is made emphatically (as if no supporting evidence were necessary);
Synonyms: assertion / averment
From wordnet.princeton.edu