Vis impressa
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
Immediate or proximate force.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
The original act of force out of which an injury arises, as distinguished from "vis proxima," the proximate force, or immediate cause of the injury. 2 Greenl. Ev. § 224.
Defined under Vis in Black's Law Dictionary.