One who has no interest in the cause or matter in issue, and who is lawfully competent to testify. Jonesv. Larrabee, 47 Me. 474 ; Warren v. Baxter. 48 Me. 195; Appeal of Combs, 105 Pa. 155;State v. Easterlin, 01 S. C. 71, 39 S. E. 250.
Black’s Law Online Dictionary