English

Definition of IOU noun from the Oxford Advanced Learner's Dictionary

 

IOU

 noun
noun
BrE BrE//ˌaɪ əʊ ˈjuː//
 
; NAmE NAmE//ˌaɪ ˈjuː//
 
(informal)
 
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a written promise that you will pay somebody the money you owe them (a way of writing ‘I owe you’) an IOU for £100 Word Origin late 18th cent.: representing the pronunciation of I owe you.
See the Oxford Advanced American Dictionary entry: IOU