Definition of hub
1
: the central part of a circular object (such as a wheel or propeller)
- spokes attached to the hub of the wheel
2 a
: a center of activity : focal point
- The island is a major tourist hub.
b
: an airport or city through which an airline routes most of its traffic
c
: a central device that connects multiple computers on a single network (see 1network 3b)
3
: a steel punch from which a working die (see 2die 3a) for a coin or medal is made
