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.
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 rate: the synchronous flapping of a bird’s wings

synchronous syn·chro·nous (sĭng’krə-nəs, sĭn’-)
Occurring or existing at the same time.

operating system, communications
1. Two or more processes that depend upon the occurrences of specific events such as common timing signals.
2. Occurring at the same time or at the same rate or with a regular or predictable time relationship or sequence.
Opposite: asynchronous.


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    communications (SDLC) An IBM protocol. A discipline conforming to subsets of the ADCCP of ANSI and the HDLC of the International Organization for Standardization. SDLC manages synchronous, code-transparent, bit-serial communication which can be duplex or half-duplex; switched or non-switched; point-to-point, multipoint, or loop. Compare Binary Synchronous Communication. (1995-03-22)

  • Synchronous digital hierarchy

    communications, standard (SDH) An international digital telecommunications network hierarchy which standardises transmission around the bit rate of 51.84 megabits per second, which is also called STS-1. Multiples of this bit rate comprise higher bit rate streams. Thus STS-3 is 3 times STS-1, STS-12 is 12 times STS-1, and so on. STS-3 is the lowest bit […]

  • Synchronous dram

    Synchronous Dynamic Random Access Memory

  • Synchronous idle

    character (SYN) The mnemonic for ASCII character 22. [Why?] (1996-06-28)

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