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Sgt Mike, good job stirring things up!
There are mathematical calculations of case capacity to bore diameter, but still there is no accepted by everyone definition of overbore. I think it being the opposite of underbore is the most precise definition proffered.
I am not allowed entry into the club of overbore fans. The only calibers in bottle necked cartridges I own are .223, 7.62 x 25, 7.32 x 39, .308, .30-06, 7.62 x 54R and .375 H&H. I’m so boring. I think I’ll go load some .45-70.