As a constructed language, Esperanto is not genealogically related to any ethnic language. Esperanto can be described as "a language lexically predominantly Romanic, morphologically intensively agglutinative and to a certain degree isolating in character". The phonology, grammar, vocabulary, and semantics are based on the western Indo-European languages. The phonemic inventory is essentially Slavic, as is much of the semantics, while the vocabulary derives primarily from the Romance languages, with a lesser contribution from Germanic. Pragmatics and other aspects of the language not specified by Zamenhof's original documents were influenced by the native languages of early speakers, primarily Russian, Polish, German, and French.
Typologically, Esperanto has prepositions and a pragmatic word order that by default is Subject Verb Object and Adjective Noun. New words are formed through extensive prefixing and suffixing.