The effective centre of an activity, region, or network.
‘the city has always been the financial hub of the country’
‘the kitchen was the hub of family life’
More example sentences
‘Even as she got older and became physically less able, she was still as sharp as a button and the central hub for all of us.’
‘Clubs need to be innovative, family friendly and at the hub of local activity.’
‘They were the hubs around which the wheels of the villages revolved.’
‘It serves to provide a central hub for documents and information related to biodiversity.’
‘We should find more hubs and semi - hubs in the discussions forums network then at other networks.’

Oxford Dictionary