Definition of synchronous
1
: happening, existing, or arising at precisely the same time
2
: recurring or operating at exactly the same periods
3
: involving or indicating synchronism
4a
: having the same period
also
: having the same period and phase
b
: geostationary
5
: of, used in, or being digital communication (as between computers) in which a common timing signal is established that dictates when individual bits can be transmitted and which allows for very high rates of data transfer
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Merriam-Webster unabridged
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Time Traveler for synchronous
The first known use of synchronous was in 1669
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