It's not used in the UK either. Or rather, it's a technical term in human geography, probably used by geographers all over the world, but it's only in Australia

It's not used in the UK either. Or rather, it's a technical term in human geography, probably used by geographers all over the world, but it's only in Australia that it's used in everyday language: https://en.wikipedia.org/wiki/Central_business_district https://en.wikipedia.org/wiki/Central_business_district