Meaning of “hub” in the English Dictionary

(Definition of “hub” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"hub" in American English

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hubnoun [ C ]

us /hʌb/

the central part of something, esp. of a wheel, or a center of activity:

Chicago is a major transportation hub, with the busiest airport in the US.

(Definition of “hub” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"hub" in Business English

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hubnoun [ C ]

uk /hʌb/ us

the central or main part of something, where there is most activity:

Property rentals in Mumbai, India's commercial hub, are the highest in the world.
New Orleans has traditionally been the financial hub of southeast Louisiana.

IT a machine that connects several computers together:

an ethernet hub

TRANSPORT →  hub airport

at/in the hub of things

in the place where things happen and decisions are taken:

It's that kind of attitude that will keep him in the hub of things for quite some time.

(Definition of “hub” from the Cambridge Business English Dictionary © Cambridge University Press)