- The name of an international auxiliary language designed by w:L. L. Zamenhof, L. L. Zamenhof with a base vocabulary inspired by Indo-European languages such as English, French, German, Italian, Spanish, and Russian, and having a streamlined grammar with completely regular conjugations, declensions, and inflections.
- (metaphorical) Anything that is used as a single international medium in place of plural distinct national media. Example: "The U.S. dollar is the Esperanto of currency."
Etymology: From Esperanto esperanto (one who hopes), from espérer, From sperare'' (to hope).
- Dutch: Esperanto
- French: espéranto
- German: Esperanto
- Italian: esperanto
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