noun
national of a third country
Neutral legal/diplomatic term for a person from a country other than the two directly involved in a bilateral context. Not inherently derogatory.
この協定は第三国人の権利も保護する。
This agreement also protects the rights of nationals of third countries.
noun
foreign resident in Japan (esp. Chinese and Korean)
Historically used in post-WWII Japan to refer to former colonial subjects who remained in Japan. Now considered sensitive and potentially discriminatory; avoid in modern neutral contexts.
戦後、第三国人と呼ばれた人々は様々な困難に直面した。
After the war, people referred to as 'third-country nationals' faced various hardships.
「第三国人」という表現は現在では差別的とみなされることが多い。
The expression '第三国人' is now often regarded as discriminatory.