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



BrE BrE//ˌaɪ əʊ ˈjuː//
; NAmE NAmE//ˌaɪ ˈjuː//
jump to other results
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 Originlate 18th cent.: representing the pronunciation of I owe you.
See the Oxford Advanced American Dictionary entry: IOU