The author describes the life story of Prof. Eugen Jona and evaluates all his life-work. The paper concentrates on the following three themes that made E. Jona famous: a) the inner and outer history of the Slovak language and dialectology, b) the contemporary Slovakistics with the emphasis on lexicology and lexicography, c) the literary language, linguistic culture and education. He also worked on the history of the Slovak literary language in the 19th century and this was another field where Jona made fundamental contributions.
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