adjective: occurring or existing at the same time or having the same period or phase.
Synchronization is the coordination of events to operate a system in unison. The familiar conductor of an orchestra serves to keep the orchestra in time.
Systems operating with all their parts in synchrony are said to be synchronous or in sync.
Some systems may be only approximately synchronized, or plesiochronous. For some applications relative offsets between events need to be determined, for others only the order of the event is important. Wikipedia, Synchronous
See Also
Coupling
Entrainment
Feedback
Harmony
Law of Attraction
Law of Harmony
Resonance
Sympathy