Stranger (noun)

1. A person whom one does not know or with whom one is not familiar.
2. A person who is not a member of one's family or household.
3. A person who is not a citizen of the place where they are.

Origin:

From old french estrange ("foreign, alien"), from latin extraneus ("stranger, outsider, foreigner"), from extra ("outsid.e")

Examples:

1. The stranger at the door asked for directions.
2. The young man felt like a stranger in a foreign land.
3. Strangers on a Train is a novel by Patricia Highsmith.
4. I felt like a stranger in my own home.
5. I couldn't help but feel like a stranger in the city I grew up in.