1. A person who comes from a foreign country; someone who does not owe allegiance to one's country; SYN. alien, noncitizen, outlander.
2. Someone who is not a member of a group; SYN. outsider.

ETYM Old Fren. estrangier, French étranger. Related to Strange.
Anyone who does not belong in the environment in which they are found; SYN. alien, unknown.