That causes.
1829. Jas. Mill, Hum. Mind, xiv. § 2 (1869), 43. Cause in these cases is a short name for causing object.
1883. M. Schuyler, in Harpers Mag., Nov., 878. The causing cause of the building of the Metropolitan Opera-house was [etc.].
Hence Causingness.
1829. Jas. Mill, Hum. Mind, xiv. § 2 (1869), 43. Cause and Effect are often used in the abstract sense, in which case Cause means the same thing as would be expressed by Causingness.