hub /hʌb/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Origin: Probably from ⇨ ↑ hob (1) ]
1 . the central and most important part of an area, system, activity etc, which all the other parts are connected to SYN centre
Birmingham is at the hub of Britain’s motorway network.
the commercial hub of the region
2 . the central part of a wheel to which the ↑ axle is joined