Donaudampfschifffahrtselektrizitätenhauptbetriebswerkbauunterbeamtengesellschaft (Listen) means "Society of subordinate officials of the construction of the main power plant of the Danube steamship company".
Although there is no documentary proof of the existence of such a society, the word appears in the 1996 Guiness record as the longest German word, with 79 characters, although it does not appear in dictionaries.
According to the last orthographic reform, this word should pass to 80 characters: Donaudampfschifffahrtselektrizitätenhauptbetriebswerkbauunterbeamtengesellschaft.
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