“World language” in Japanese
Short answer
World language in Japanese is “国際語” (kokusaigo). Full meaning: international language, world language, global lingua franca; constructed international auxiliary language (e.g. Esperanto).
Other ways to say “World language” in Japanese
世界語
sekaigo international language, world language, global lingua franca; constructed international auxiliary language (e.g. Esperanto)
世界言語
sekaigengo global language, world language; languages of the world, world languages
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