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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
database transaction
A set of related changes applied to a database. The
term typically implies that either all of the changes should be
applied or, in the event of an error, none of them, i.e. the
transaction should be atomic. Atomicity is one of the ACID
properties a transaction can have, another is isolation -
preventing interference between processes trying to access the
database cocurrently. This is usually achieved by some form of
locking - where one process takes exclusive control of a
database table or row for the duration of the transaction,
preventing other processes from accessing the locked data.
The canonical example of a transaction is transferring money
between two bank accounts by subtracting it from one and adding it
to the other.
Some relational database management systems require the user to
explicitly start a transaction and then either commit it (if all
the individual steps are successful) or roll it back (if there are
any errors).
(2013-06-03)