Esperanto
Concise Oxford English Dictionary © 2008 Oxford University Press:
Esperanto /ˌɛspəˈrantəʊ/
▶noun an artificial language devised in 1887 as an international medium of communication, based on roots from the chief European languages.
– derivatives
Esperantist noun.
Esperantist noun.
– origin from Dr Esperanto, used as a pen name by the inventor of the language, Polish physician Ludwik L. Zamenhof; the literal sense is ‘one who hopes’ (based on L. sperare ‘to hope’).
'Esperanto' also found in these Oxford entries:

