To perform an accompanying part next to (another instrument or musician).
To perform an accompanying part or parts in a composition.
To go with or attend as a companion or associate; to keep company with; to go along with.
To supplement with; add to.
To be found at the same time.
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.