IPA: /ˈɡaɪdʒɪn/
KK: /guy-jin/
A person from outside Japan, often used to refer to foreigners living or visiting Japan.
As a gaijin, I found it interesting to learn about Japanese culture.
Gaijin is a Japanese word formed from "gai" (meaning outside) and "jin" (meaning person). It refers to a person from outside Japan, typically a foreigner.
Think of someone who is 'from outside' ('gai') — that's why 'gaijin' means a person from outside Japan.