synchroneity

noun

syn·​chro·​ne·​i·​ty ˌsiŋ-krə-ˈnē-ə-tē 

ˌsin-,

-ˈnā-

plural synchroneities

: the state of being synchronous

Word History

Etymology

synchronous + -eity (as in spontaneity)

First Known Use

circa 1909, in the meaning defined above