sync Syllabification: (sync)Pronunciation: /siNGk/ (also synch) informalTranslate sync | into German Definition of sync noun synchronization:images flash onto your screen in sync with the music verb [with object] synchronize:the flash needs to be synced to your cameraPhrases in (or out of) sync working well (or badly) together; in (or out of) agreement:her eyes and her brain seemed to be seriously out of syncOrigin: 1920s: abbreviationsync in other Oxford dictionaries Definition of sync in the British & World English dictionary