To interact.
To respond through reaction.
To have a connection.
To bring into a relation, association, or connection (between one thing and another).
To identify with; to understand.
To tell in a descriptive way.
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.