Definition: The word "cotter" is a biblical term meaning "an upright man." It was used to designate an individual who followed God's commandments, as contrasted with those who did not (Gen 4:2; Ro 3:20). The precise definition varies depending on the context. For instance, in the New Testament, it refers specifically to a Gentile believer (Acts 16:19-21; 2 Pet 2:9-10), but its usage can also refer broadly to any person who adhered to God's word and worshiped Him wholeheartedly (Ps 51:12-13).