A movement or ideology supporting the use and adoption of Esperanto, an artificial international language created in 1887.
From Esperanto (the language name itself from Dr. L.L. Zamenhof's pen name 'Doktoro Esperanto' meaning 'one who hopes') plus the suffix -ism denoting a movement or system of beliefs.
Esperantism represents one of history's most optimistic linguistic experiments—people genuinely believed a shared language could eliminate war and foster world peace, and some communities still speak it today!
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