Tibor Sekelj languages spoken, written or signed Esperanto
Polyglot
Sekelj learned 25 languages and countless dialects, of which he retained nine at the end of his life: Hungarian, Serbian, German, Esperanto, Italian, English, French, Spanish, Portuguese.  Of these he wrote extensively in Spanish, Esperanto and the Serbo-Croatian, He was an interpreter on his travels and as part of his work for PIF during acceptances, arrangements etc.
linguistic abilities language proficiency language command