Definition of IOU in English:

IOU

noun

  • A signed document acknowledging a debt.

    voucher, coupon, chit, docket, stamp, order, credit note
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Origin

Late 18th century: representing the pronunciation of I owe you.

Pronunciation

IOU

/ˈˌī ˌō ˈyo͞o//ˈˌaɪ ˌoʊ ˈju/