To make things compatible or consistent.
To make the net difference in credits and debits of a financial account agree with the balance.
To restore a friendly relationship; to bring back to harmony.
To synchronize, especially in the senses of data synchronization, time synchronization, or synchronizing music with video.
To flush all pending I/O operations to disk.
A music synchronization license, allowing the music to be synchronized with visual media such as films.
Harmony.