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assertation

noun
as·​ser·​ta·​tion | \ˌa-sər-ˈtā-shən \
plural assertations

Definition of assertation 

: the act of asserting or something that is asserted : assertion This crisis, which inspires repeated heartfelt assertations of Mr. Richburg's happiness to be an American …— William Finnegan, New York Times Book Review, 30 Mar. 1997 What I have said so far has not been an attempt to support my thesis but merely to explain what it is. Of course, a fuller understanding of an assertation may convince someone of its truth.— Clifford Williams, The Life of the Mind, 2002

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First Known Use of assertation

circa 1535, in the meaning defined above

History and Etymology for assertation

borrowed from French & Medieval Latin; French assertation, borrowed from Medieval Latin assertātiōn-, assertātiō, from assertāre “to affirm, assert” (frequentative of Latin asserere “to lay claim to, allege, assert”) + Latin -tiōn-, -tiō, noun suffix

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The first known use of assertation was circa 1535

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