Monography ('Antonymy in Standard Slovenian on the Example of Terminological Dictionaries') deals with antonymy in Slovenian dictionaries, especially in terminological, with linguistic theories about antonyms, lexicographical theories about the presentation of antomyms in general language and terminological dictionaries, with types of antonymes in dictionaries of diferent sciences, most frequent mistakes. The presentation of antonyms in Slovenian dictionaries has a long tradition, starting already in the so-called non-standard dictionaries pertaining to the language works of Slovenian Protestants and continuing with Cigale’s Znanstvena terminologija s posebnim ozirom na srednja učilišča (Scientific Terminology with Special Focus on Secondary Schools, 1880), where antonyms were marked for the first time in the form of notes opp. (opponitur).