What is Impotence?

Legal Definition
Med. jur. The incapacity for copulation or propagating the species. It has also been used synonymously with sterility.

2. Impotence may be considered as incurable, ourable, accidental or temporary. Absolute or incurable impotence, is that for which there is no known relief, principally originating in some malformation or defect of the genital organs. Where this defect existed at the time of the marriage, and was incurable, by the ecclesiastical law and the law of several of the American states, the marriage may be declared void ab initio. Com. Dig. Baron and Feme, C 3; Bac. Ab. Marriage, &c., E 3; 1 Bl. Com. 440; Beck's Med. Jur. 67; Code, lib. 5, t. 17, l. 10; Poynt. on Marr. and Div. ch. 8; 5 Paige, 554; Merl. R«p. mot Impuissance. But it seems the party naturally impotent cannot allege that fact for the purpose of obtaining a divorce. 3 Phillim. R. 147; S. C. 1 Eng. Eccl. R. 384. See 3 Phillim. R. 325; S. C. 1 Eng. Eccl. R. 408; 1 Chit. Med. Jur. 877; 1 Par. & Fonbl. 172, 173. note d; Ryan's Med. Jur. 95. to 111; 1 Bl. Com. 440; 2 Phillm. R. 10; 1 Hagg. R. 725. See, as to the signs of impotence, 1 Briand, M«d. L«g. c. 2, art. 2, 2, n. 1; Dictionnaire des Sciences M«dicales, art. Impuissance; and, generally, Trebuchet, Jur. de la. Med. 100, 101, 102; 1 State Tr. 315; 8 State Tr. App. No. 1, p. 23; 3 Phillm. R. 147; 1 Hagg. Eccl. R. 523; Foder«, M«d. L«g. 237.
-- Bouviers Law Dictionary
Legal Definition
In medical jurisprudence, The incapacity for copulation or propagating the species. Properly used of the male; but it has also been used synonymously with "sterility." Griffeth v. Griffeth, 162 111. 368, 44 N. E. 820; Payne v. Payne, 46 Minn. 467, 49 N. W. 230, 24 Am. St. Rep. 240; Kempf v. Kempf, 34 Mo. 213.
-- Black's Law Dictionary
Legal Definition
Incapacity for sexual intercourse. See 28 Am. Dec. 448, note.
-- Ballentine's Law Dictionary