Short for synchronization. (1) The process of ensuring that the clocks of two or more systems remain locked together, counting at the same rate. This term is commonly used in the context of locking an audio track to a video track. See also clock, clock drift, SMPTE timecode. (2) In a printing dialog extension, a procedure that maintains the correspondence between the current user interface settings and their recorded values in a job ticket. (3) In Sync Services, the process of establishing and maintaining data consistency between multiple clients.