    Context:
    ```
    First, we devised eight question categories, such as Fermi problems, roleplay scenarios, and coding/math tasks, to test various aspects of a chatbot''s performance.
    ```
    
    For the context above, output a Python json object for the lexical unit 'Fermi' in the following format:
    {
       "meaning": "<a detailed contextual meaning of the lexical unit, with no more than 500 words>"
    }
 

    json = 