an act or instance of rolling back.
a return to a lower level of prices, wages, etc., as by government order.
a pulling back or withdrawal: a rollback of attack forces.

1935–40; noun use of verb phrase roll back Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Computing Dictionary

rollback definition

Reverting data in a database to an earlier state, usually in response to an error or aborted operation.
In a transaction based database system, transactions are considered atomic. If an error occurs while performing a transaction, the database is automatically rolled back to the state at the previous commit.
Rollback may also be performed by an explicit rollback transaction.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
But too aggressive a rollback of the military would likely result in a backlash
  that could jeopardize gains made this year.
The commission recommends a rollback of convenience gambling operations.
It is unlikely that the tide of economic progress that has started will
It is highly likely that additional rollback proposals will be made in the near
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