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1. Occurring or existing at the same time. See Synonyms at contemporary.
2. Moving or operating at the same rate: synchronous motors.
a. Having identical periods.
b. Having identical period and phase: synchronous oscillations.
c. Relating to or being a satellite that orbits a celestial body at a speed that matches the body's rotation, thus remaining stationary as observed from the body's surface.
d. Synchronized by an electronic clock: synchronous signaling.
[From Late Latin synchronus, from Greek sunkhronos : sun-, syn- + khronos, time.]