/ Dictionary / Index S sync: Meaning and Definition of Find definitions for: sync Pronunciation: (singk), [key] — Informal. Informal. —n. (used esp. in the phrases in sync and out of sync) synchronization: The picture and the soundtrack were out of sync. harmony or harmonious relationship: Management wants to be in sync with the client's wishes. —v.i., v.t. to synchronize; harmonize. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sync (Thesaurus) synaxis syncarp Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language