1. Occurring or existing at the same time or having the same period or phase
   "a synchronous set of clocks"; "the synchronous action of a bird's wings in flight"; "synchronous oscillations"; "recovery was synchronous with therapy";
   - synchronal [archaic], synchronic
    
2. (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
   "The synchronous data transfer ensured that all bits arrived in the correct order"

See also: coetaneous, coeval, coexistent, coexisting, coincident, coincidental, coinciding, concurrent, contemporaneous, contemporary, co-occurrent, parallel, simultaneous, synchronic, synchronised [Brit], synchronized

Antonym: asynchronous

Encyclopedia: Synchronous