1.Definition: (digital communication) pertaining to a transmission technique that requires a common clock signal (a timing reference) between the communicating devices in order to coordinate their transmissions

2.Definition: occurring or existing at the same time or having the same period or phase

"Recovery was synchronous with therapy", "A synchronous set of clocks", "The synchronous action of a bird's wings in flight", "Synchronous oscillations"

Related Adjective(s):synchronal, synchronic