sync or synch 
(sĭngk) Informal
(sĭngk) Informal n.
1. Synchronization: "an effect like that of stereo speakers slightly out of sync" (Time).
2. Harmony; accord: in sync with today's fashions.
intr. & tr.v. synced, sync·ing, syncs or synched or synch·ing or synchs
To synchronize.