Definition of armband noun from the Oxford Advanced American Dictionary

 

armband

 noun
noun
NAmE//ˈɑrmbænd//
 
 
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a cloth band worn around the arm as a sign of something, for example that someone has an official position The stewards all wore armbands. Many people at the funeral service were wearing black armbands.
See the Oxford Advanced Learner's Dictionary entry: armband