syn·chro·nize 
(sĭngkrə-nīz′, sĭn-)
(sĭngkrə-nīz′, sĭn-)v. syn·chro·nized, syn·chro·niz·ing, syn·chro·niz·es
v.tr.
1.
a. To cause to occur or operate with exact coincidence in time or rate: The military units synchronized their operations. We synchronized our watches.
b. To cause to occur or operate at the same time as something else: They synchronized their trip with the annual tulip festival.
2. To represent (events) as occurring at the same time or in the same time period.
3. To arrange (a video or soundtrack, for example) to play or operate in synchronization with something else.
4.
a. To transfer data between (two devices) to ensure that the same data is stored on both.
b. To execute such a transfer to cause the content of (two or more files or other sets of data) to be identical.
v.intr.
1. To occur at the same time; be simultaneous: The light flashes of fireflies tend to synchronize with one another.
2. To operate in unison.
[Greek sunkhronizein, to be contemporary, from sunkhronos, contemporaneous; see SYNCHRONOUS.]
syn′chro·ni·zation (-nĭ-zāshən) n.
synchro·niz′er n.