One who is not part of a community or organization.While the initiated easily understand the symbols, they are wholly inaccessible to outsiders.
A newcomer with little or no experience in an organization or community.Seeing the mess professional politicians have made of things is it any wonder the electorate is beginning to prefer outsiders.
A competitor or contestant who has little chance of winning; a long shot; a dark horseJohnny was an outsider at this years karate tournament, but he still managed to win second place out of sheer determination.