Definition of the mainland noun from the Oxford Advanced American Dictionary

 

the mainland

 noun
noun
NAmE//ˈmeɪnlænd//
 
, NAmE//ˈmeɪnlənd//
 
[singular]
 
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the main area of land of a country, not including any islands near to it a boat to/from the mainland The hurricane is now threatening the U.S. mainland.
mainlandadjective[only before noun]
 
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mainland Greece
See the Oxford Advanced Learner's Dictionary entry: the mainland