hub

US /hʌb/
UK /hʌb/
"hub" picture
1.

the central part of a wheel, rotating on or with the axle, and from which the spokes radiate

:
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The bicycle wheel's hub was greased for smoother rotation.
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The spokes connect from the rim to the hub.
:
centerpivotaxis
2.

the effective center of an activity, region, or network

:
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London is a major financial hub.
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The airport serves as a regional travel hub.
:
centercorenexusfocal pointheart