The main difference between an essentially contestable concept from a well-defined term is that the first one has concerns over its legitimacy while the second one is widely accepted.
This refers to the idea which is not properly established that arguments can be made about it which can lead to contests on its legitimacy
On the other hand, a well defined term is one that has been theorized, hypothesised and found to have met all criteria and as such CANNOT be questioned on its legitimacy
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