expression
citizen of the world; world citizen
A person who identifies as a member of the global community rather than of a single nation. Often used in philosophical or idealistic contexts.
彼は自分を世界公民だと考えている。
He considers himself a citizen of the world.
地球市民 is a more common modern term for 'global citizen', while 世界公民 is a slightly older or more formal expression.
Compound of 世界 (world) and 公民 (citizen). The term is a direct translation of the English 'citizen of the world' or 'world citizen', likely entering Japanese through philosophical or political discourse.