apodixis

alternative apodeixis

1. rhetoricFull demonstration or showing; absolute and incontrovertible proof.

   ... this [bold assertion of defiance] might taste of a desperate will, if he had not afterwards given an apodixis in the battle ...

   1647, George Buck, History of Richard III

   1 more example

   Pythagoras, engaged in showing that the square on the hypotenuse of a right-angled triangle is equal to the sum of the squares on the other two sides, is committed to apodeixis; Mark Anthony, arguing that the demonstrable generosity and benevolence of Caesar towards the people of Rome showed him to be a most unlikely candidate for the character of an ambitious tyrant, resorts to pistis, argument on the grounds of probability.

   1989, Walter Nash, Rhetoric: The Wit of Persuasion