IPA: /ˈstreɪndʒər/
KK: /ˈstreɪndʒər/
Not familiar or known; someone or something that is not recognized or is new to a person.
She felt like a stranger in a new city.
A person that you do not know or who is not familiar to you.
I saw a stranger walking down the street.
Stranger → It is formed from "strange" (from Old French *estrange*, meaning foreign or unfamiliar) and "-er" (meaning a person who). A stranger is a person who is foreign or unfamiliar to a particular place or group.
Think of someone who is 'foreign' or 'unfamiliar' — that's what a stranger is, a person who is not known in a certain context.