Not to have the same traits or characteristics; to be unalike or distinct.
To have diverging opinions, disagree.
To be separated in quantity.
A program that diffs, a diff.
A music synchronization license, allowing the music to be synchronized with visual media such as films.
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.