1795, in the meaning defined at sense 1
from the pronunciation of I owe you
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Cite this Entry
“IOU.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/IOU. Accessed 1 Aug. 2021.
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See the full definition for IOU in the English Language Learners Dictionary
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Nglish: Translation of IOU for Spanish Speakers
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