asynchronous

[ey-sing-kruh-nuhs]
adjective
1.
not occurring at the same time.
2.
(of a computer or other electrical machine) having each operation started only after the preceding operation is completed.
3.
Computers, Telecommunications. of or pertaining to operation without the use of fixed time intervals (opposed to synchronous ).

Origin:
1740–50; a-6 + synchronous

asynchronously, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
asynchronism (æˈsɪŋkrəˌnɪzəm, eɪ-)
 
n
a lack of synchronism; occurrence at different times
 
a'synchronous
 
adj
 
a'synchronously
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

asynchronous
1748, from a-, privative prefix, + synchronous.
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

asynchronous definition

architecture
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.
(1995-12-08)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
It succeeded so spectacularly, however, that what was once blissfully
  asynchronous is now woefully chronic.
Real-time and speedy synchronous and asynchronous communication options abound.
In the past the main problem with asynchronous induction motors was the
  difficulty of varying their speed.
The illusion failed when the stroking was asynchronous.
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