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instrument definition - legal

n

A written legal document defining the partiesÂ’ rights and liabilities to one another.
negotiable instrument
Under the Uniform Commercial Code, a writing that reflects an unconditional promise to pay, such as a check or note, but does not also include security for the payment. 

Webster's New World Law Dictionary Copyright © 2006 by Wiley Publishing, Inc., Hoboken, New Jersey.
Used by arrangement with John Wiley & Sons, Inc.

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