Esperanto
noun
Es·pe·ran·to ˌe-spə-ˈrän-(ˌ)tō 
-ˈran-(ˌ)tō
-ˈran-(ˌ)tō : an artificial international language based as far as possible on words common to the chief European languages
Esperantist
ˌe-spə-ˈrän-tist
noun or adjective -ˈran-
Word History
Etymology
Dr. Esperanto, pseudonym of L. L. Zamenhof †1917 Polish oculist, its inventor
First Known Use
1892, in the meaning defined above