"Shared" by who? And whose definition should we use? The "common" one, or say, the one used by academics. I woult not claim that my "definition" is found in boo

"Shared" by who? And whose definition should we use? The "common" one, or say, the one used by academics. I woult not claim that my "definition" is found in books, but I chose my words carefully (I have a background in political philosophy)