Metropolitan France is a phrase means European France, ie France without her overseas regions, departments and collectivities. I’ve been familiar with this phrase for a long time but only recently wondered how this gels with the other meanings of metropolitan, which further made me think of what the etymology might be.
What is the connection with words in which metro- connotes measurement, such as metronome and metrology? Was it a measurement of the city?
It turns out that metropolitan, metropolis etc derive from the Greek meter meaning “mother”, not the Greek metron meaning “measure”. Unexpected! The metropolis is the mother city.