You are right of course, generally they don’t but at least one philosoper I know of wrote a dictionary: https://history.hanover.edu/texts/voltaire/volindex.html

You are right of course, generally they don’t but at least one philosoper I know of wrote a dictionary: https://history.hanover.edu/texts/voltaire/volindex.html https://history.hanover.edu/texts/voltaire/volindex.html But I think definitions are in the foundation of philosophy because if philosophers argue with badly defined or undefined words, the discussion turns into a discussion to assert academic authority. In this case, definitions of words are not explicit but implicit. I think this is what most people think philosophy is, ie sophistry. In computer languages I cannot use an undefined word. I would get an error message. It would be nice to institute a similar mechanism in philosophical discussions too.