hubhub /hʌb/ noun [countableC]1COMMERCE a city or country where there is a lot of business activity because it is central in relation to other places, there are good communications etcThe city has become a hub for Asian markets and a financial center.
2TRAVELan airport with a lot of flights where people can easily change planes to go on to somewhere elseThey want to develop the airport as a European hub.