(mathematics, logic) The method of disproving a statement by assuming the statement is true and, with that assumption, arriving at a blatant contradiction.

(neurology) Of vision, by the Donders standards.

(rhetoric) The false proof of a statement by (prolonged) repetition, possibly by different people.

(rhetoric) argumentum ad populum.

(rhetoric) A fallacious argument that concludes a proposition to be true because many or all people believe it; it alleges that “if many believe so, it is so”.

plural of terminus ad quem

plural of reductio ad absurdum

(rhetoric) The use or threat of force to coerce acceptance of an argument.

(rhetoric) The logical fallacy of concluding that a proposition is correct because the person advancing it is rich.

plural of argumentum ad crumenam