Definition of bellwether noun from the Oxford Advanced American Dictionary

 

bellwether

 noun
noun
NAmE//ˈbɛlˌwɛðər//
 
[usually singular]
 
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something that is used as a sign of what will happen in the future College campuses are often the bellwether of change. Ohio is seen as a bellwether state in this election.
See the Oxford Advanced Learner's Dictionary entry: bellwether