- occurring at the same time; coinciding in time; contemporaneous; simultaneous.
- going on at the same rate and exactly together; recurring together.
- Physics, Electricity. having the same frequency and zero phase difference.
- Computers, Telecommunications. of, relating to, or operating using fixed-time intervals controlled by a clock (opposed to asynchronous).
- Aerospace. geostationary.
Origin of synchronous
- occurring at the same time; contemporaneous
- physics (of periodic phenomena, such as voltages) having the same frequency and phase
- occurring or recurring exactly together and at the same ratethe synchronous flapping of a bird's wings
Word Origin and History for nonsynchronous
1660s, "existing or happening at the same time," from Late Latin synchronus "simultaneous," from Greek synchronos "happening at the same time," from syn- "together" (see syn-) + khronos "time" (see chrono-). Meaning "recurring at the same successive instants of time" is attested from 1670s.
- Occurring or existing at the same time.