Pronunciation: (singk), [key] Informal.
—n. (used esp. in the phrases in sync and out of sync)
1. Also,synchPronunciation: (singk), [key]synchronization: The picture and the soundtrack were out of sync.
2. harmony or harmonious relationship: Management wants to be in sync with the client's wishes.
to synchronize; harmonize.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.