proof; evidence.-a reason or reasons offered in proof, to induce belief, or convince the mind; reasoning expressed in words; as, an argument about, concerning, or regarding a proposition, for or in favor of it, or against it.-a process of reasoning, or a controversy made up of rational proofs; argumentation; discussion; disputation.-the subject matter of a discourse, writing, or artistic representation; theme or topic; also, an abstract or summary, as of the contents of a book, chapter, poem.-matter for question; business in hand.-the quantity on which another quantity in a table depends; as, the altitude is the argument of the refraction.-the independent variable upon whose value that of a function depends.-to make an argument; to argue.