Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for I O U from the 1913 edition of Webster's Revised Unabridged Dictionary. Define I O U using one of the most comprehensive free online dictionaries on the web.

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Part of Speech: noun
Results: 1
1. A paper having on it these letters, with a sum named, and duly signed; - in use in England as an acknowledgment of a debt, and taken as evidence thereof, but not amounting to a promissory note; a due bill.
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