• Webster's Revised Unabridged Dictionary
    • a Assertorial Asserting that a thing is; -- opposed to problematical and apodeictical.
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Century Dictionary and Cyclopedia
    • assertorial Asserting a fact as true, but not holding it to be necessary. See assertory, the common form.
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In literature:

He merely made an assertory oath in a prescribed form.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 1" by Various