n. pl. syn·chro·nic·i·ties
1. The state or fact of being synchronous or simultaneous; synchronism.
2. Coincidence of events that seem to be meaningfully related, conceived in Jungian theory as an explanatory principle on the same order as causality.
The American Heritage® Dictionary of the English Language, Fourth Edition copyright ©2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
(Psychology) an apparently meaningful coincidence in time of two or more similar or identical events that are causally unrelated
[coined by Carl Jung from synchronic + -ity]
Collins English Dictionary – Complete and Unabridged © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003