1. (sometimes caps.) a member of an organization of boys (Boy' Scouts"), founded in England in 1908 by Lieut. Gen. Sir Robert S. S. Baden-Powell, that seeks to develop certain skills in its members, as well as character, self-reliance, and usefulness to others.
2. a member of any similar society elsewhere.
3. Sometimes Disparaging.a person whose good deeds, obligingness, idealism, etc., exceed normal expectations.