Voluntary payment
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A payment made by a debtor of his own will and choice, as distinguished from one exacted from him by process of execution or other compulsion.
Redmond v. New York, 125 N. Y. 632, 26 N. El 727; Rumford Chemical Works v. Ray, 19 R. I. 456, 34 Atl. 814 ; Taggart v. Rice, 37 Vt. 47; Maxwell v. Griswold, 10 How. 255, 13 L. Ed. 405.