In the dictionaries you will find keyword-based secondary information. You can find an overview of the dictionaries via the main menu (dictionaries). In this overview you can choose between different dictionaries and search for terms.
If you click on an entry, the detail view appears. Further dictionaries with entries for the same term are linked on the right.
Hits from dictionaries are also displayed in the sidebar of the search view. So you can quickly get further information about terms.