国こく際さい語ご

noun

international language; world language; global lingua franca

A language used for communication between people from different countries, such as English today.

• 英えい語ごは現げん代だいの国こく際さい語ごだ。

  English is the international language of today.

noun

constructed international auxiliary language

Specifically refers to planned languages like Esperanto, often contrasted with naturally evolved international languages.

See also: 国際補助語

• エスペラントは有ゆう名めいな国こく際さい語ごの一ひとつです。

  Esperanto is one of the well-known international auxiliary languages.