It’s very easy for discussions to get hung up on definitions, so a serious approach to debating a subject begins with synchronizing everyone’s vocabulary watches. Accurate and nuanced communication requires mutually understood ideas and terminology for expressing those ideas.
Yet some concepts seem almost impossible to define clearly. The idea of “consciousness” is notorious for being a definition challenge, but “morality” or “justice” or “love” are also very difficult to pin down. At the same time, we seem to share mutual basic intuitions of these things.
So the question today is: why are some concepts so hard to define?