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Definition of IOU noun from the Oxford Advanced American Dictionary

 

IOU

 noun
noun
NAmE//ˌaɪ oʊ ˈyu//
 
(informal)
 
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a written promise that you will pay someone the money you owe them (a way of writing “I owe you”) an IOU for $20
See IOU in the Oxford Advanced Learner's Dictionary
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