"Assertory" is a word in ENGLISH

assertory ENGLISH
Definition:

Affirming; maintaining.

Few words of positivity

And no wonder; for the new technique of "subliminal projection," as it was called, was intimately associated with mass entertainment, and in the life of civilized human beings massed entertainment now plays a part comparable to that played in the Middle Ages be religion.

Aldous Huxley, Brave New World / Brave New World Revisited

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affirm ENGLISH

To assert positively; to tell with confidence; to aver; to maintain as true; -- opposed to deny.

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affirmative ENGLISH

That which affirms as opposed to that which denies; an affirmative proposition; that side of question which affirms or maintains …

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assertor ENGLISH

One who asserts or avers; one who maintains or vindicates a claim or a right; an affirmer, supporter, or vindicator; …

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maintain ENGLISH

To affirm; to support or defend by argument.

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verify ENGLISH

To maintain; to affirm; to support.

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vouch ENGLISH

To warrant; to maintain by affirmations; to attest; to affirm; to avouch.

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