Definition of heartland noun from the Oxford Advanced American Dictionary

     

    heartland

     noun
    noun
    NAmE//ˈhɑrtlænd//
     
    heartlands [plural]
     
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  1. 1the central part of a country or an area the great Russian heartlands
  2. 2 an area that is important for a particular activity or political party the industrial heartland of Germany the traditional Democratic heartland in Pennsylvania
See the Oxford Advanced Learner's Dictionary entry: heartland