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nonrepeatable read (n)~ An inconsistency that occurs when a transaction reads the same row more than once and a separate transaction modifies that row between reads. nonrepudiation (n)~ The use of cryptography to ensure that someone performing an action on a computer cannot falsely deny that they performed that action. A system with nonrepudiation provides undeniable proof that a user took a specific action such as transferring money authorizing a purchase or sending a message.