Oxford Advanced American Dictionary

Definition of regional adjective from the Oxford Advanced Learner's Dictionary

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regional

adjective
regional pronunciation English ˈriːdʒənl regional pronunciation American ˈriːdʒənl
[usually before noun]
 
of or relating to a region
regional variations in pronunciationthe conflict between regional and national interestsregional councils/elections/newspapersregionally
regionally pronunciation English ˈriːdʒənəli regionally pronunciation American ˈriːdʒənəli
adverbregionally based television companies