We have definitions for both a square and a circle. By definition, I understand that it's impossible to have a square circle. However, why does the word 'square' have to necessarily mean 'a plane figure with four equal sides'? Conceivably, the word square could have been defined as a 'round plane'? Thus making 'a square circle is metaphysically impossible' false?
I'm new to philosophy. So if this question is pathetic I apologize.