Adjective synchronous has 2 senses
  1. synchronous, synchronal, synchronic - occurring or existing at the same time or having the same period or phase; "recovery was synchronous with therapy"- Jour.A.M.A.; "a synchronous set of clocks"; "the synchronous action of a bird's wings in flight"; "synchronous oscillations"
    Antonyms: asynchronous, allochronic, anachronic, anachronous, anachronistic, nonsynchronous, unsynchronized, unsynchronised, unsynchronous, serial, in series, nonparallel
  2. synchronous - (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
    Antonym:
    asynchronous
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