Definition of hub noun from the Oxford Advanced American Dictionary

     

    hub

     noun
    noun
    NAmE//hʌb//
     
     
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  1. 1[usually singular] hub (of something) the central and most important part of a particular place or activity the commercial hub of the city The kitchen was the hub of family life. to be at the hub of things (= where things happen and important decisions are made) a hub airport (= a large important one where people often change from one plane to another)
  2. 2the central part of a wheel
See the Oxford Advanced Learner's Dictionary entry: hub