stranger

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. One who is neither a friend nor an acquaintance.
2. n. A foreigner, newcomer, or outsider.
3. n. One who is unaccustomed to or unacquainted with something specified; a novice: a stranger to our language; no stranger to hardship.
4. n. A visitor or guest.
5. n. Law One that is neither privy nor party to a title, act, or contract.

Century Dictionary and Cyclopedia

1. n. One who comes from another country or region; a foreigner.
2. n. A person with whom one is not acquainted; one whose name and character are unknown.
3. n. One who is ignorant (of) or unacquainted (with): with to.
4. n. One not belonging to the house; a guest; a visitor.
5. n. In law, one not privy or party to an act.
6. n. Some thing popularly supposed or humorously said to betoken the approach of a stranger or guest, as guttering in a candle or a teastalk in a cup of tea.
7. n. Specifically, in entomology, the noctuid moth Hadena peregrina: an English collectors' name.
8. To estrange; alienate.
9. n. A name in Victoria and Tasmania for a labroid fish, Odax richardsoni. Also called rock-whiting.

Wiktionary

1. adj. comparative form of strange: more strange
2. n. A person whom one does not know; a person who is neither a friend nor an acquaintance.
3. n. An outsider or foreigner
4. n. A newcomer.
5. n. humorous One who has not been seen for a long time.
6. v. obsolete, transitive To estrange; to alienate.

GNU Webster's 1913

1. n. One who is strange, foreign, or unknown.
2. n. One who comes from a foreign land; a foreigner.
3. n. One whose home is at a distance from the place where he is, but in the same country.
4. n. One who is unknown or unacquainted; ; hence, one not admitted to communication, fellowship, or acquaintance.
5. n. One not belonging to the family or household; a guest; a visitor.
6. n. (Law) One not privy or party an act, contract, or title; a mere intruder or intermeddler; one who interferes without right.
7. v. obsolete To estrange; to alienate.

WordNet 3.0

1. n. an individual that one is not acquainted with
2. n. anyone who does not belong in the environment in which they are found