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[ey-sing-kruh-nuh s] /eɪˈsɪŋ krə nəs/
not occurring at the same time.
(of a computer or other electrical machine) having each operation started only after the preceding operation is completed.
Computers, Telecommunications. of or relating to operation without the use of fixed time intervals (opposed to synchronous).
Origin of asynchronous
1740-50; a-6 + synchronous
Related forms
asynchronously, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Word Origin and History for asynchronous

1748, from a-, privative prefix, + synchronous.

Online Etymology Dictionary, © 2010 Douglas Harper
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asynchronous in Technology

Not synchronised by a shared signal such as clock or semaphore, proceeding independently.
Opposite: synchronous.
1. A process in a multitasking system whose execution can proceed independently, "in the background". Other processes may be started before the asynchronous process has finished.
2. A communications system in which data transmission may start at any time and is indicated by a start bit, e.g. EIA-232. A data byte (or other element defined by the protocol) ends with a stop bit. A continuous marking condition (identical to stop bits but not quantized in time), is then maintained until data resumes.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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