(rhetoric) An argument from authority, or an appeal to authority.

(rhetoric, rare) An appeal to poverty; the logical fallacy of thinking a conclusion is correct because the speaker is poor.

plural of ad valorem tax

A tax that is assessed as a proportion of the value of the property being taxed.

A company that adds some features to existing products, then resells it (usually to end-users) as an integrated product or complete turn-key solution.

(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.

plural of argumentum ad verecundiam

plural of argumentum ad hominem

(informal, rare) plural of argumentum ad hominem