Pronunciation: (sing'kru-nus), [key]
1. occurring at the same time; coinciding in time; contemporaneous; simultaneous.
2. going on at the same rate and exactly together; recurring together.
3. Physics, Elect.having the same frequency and zero phase difference.
4. Computers, Telecommunications.of, pertaining to, or operating using fixed-time intervals controlled by a clock (opposed to asynchronous).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.