Causation \Cau*sa"tion\, n. The act of causing; also the act or agency by which an effect is produced. [1913 Webster] The kind of causation by which vision is produced. --Whewell. [1913 Webster] {Law of universal causation}, the theoretical or asserted law that every event or phenomenon results from, or is the sequel of, some previous event or phenomenon, which being present, the other is certain to take place. [1913 Webster]