English
synchroneity
From synchronous + -ity.
Formed from synchronous + -ity
Ancient Greek χρόνος ‘time’
Ancient Greek σύγχρονος ‘contemporaneous’
Late Latin synchronus ‘contemporary, synchronic’
English synchronous
Today it means
noun The state or characteristic of being synchronous or synchronized.
Language periods are conventional ranges, not dates for this word.
Etymograph / synchroneity