Definition of Esperanto noun from the Oxford Advanced American Dictionary

 

Esperanto

 noun
noun
NAmE//ˌɛspəˈrɑntoʊ//
 
[uncountable]
 
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an artificial language invented in 1887 as a means of international communication, based on the main European languages but with easy grammar and pronunciation
See the Oxford Advanced Learner's Dictionary entry: Esperanto