What's the definition of a transcation?

Hi there,
I ran few ADDM report and it show to many transcations? Does Oracle define a "transaction" is when a user's commit? Please help me define the definition.
Thanks

FINDING 1: 43% impact (213 seconds)
Waits on event "log file sync" while performing COMMIT and ROLLBACK operations
were consuming significant database time.
RECOMMENDATION 1: Application Analysis, 43% benefit (213 seconds)
ACTION: Investigate application logic for possible reduction in the
number of COMMIT operations by increasing the size of transactions.
RATIONALE: The application was performing 4138 transactions per minute
with an average redo size of 4923 bytes per transaction.
RECOMMENDATION 2: Host Configuration, 43% benefit (213 seconds)
ACTION: Investigate the possibility of improving the performance of I/O
to the online redo log files.
RATIONALE: The average size of writes to the online redo log files was 4
K and the average time per write was 2 milliseconds.
SYMPTOMS THAT LED TO THE FINDING:
SYMPTOM: Wait class "Commit" was consuming significant database time.
(43% impact [213 seconds])

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