a·syn·chro·nous

[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

Related forms
a·syn·chro·nous·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
asynchronism (æˈsɪŋkrəˌnɪzəm, eɪ-) [Click for IPA pronunciation guide]
 
—n
a lack of synchronism; occurrence at different times
 
a'synchronous
 
—adj
 
a'synchronously
 
—adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Asynchronous is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
Etymonline
Word Origin & History

asynchronous
1748, from a-, privative prefix, + synchronous.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
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
In the past, the main disadvantage of asynchronous induction motors was the
  difficulty of varying their speed.
The illusion failed when the stroking was asynchronous.
It succeeded so spectacularly, however, that what was once blissfully
  asynchronous is now woefully chronic.
Research indicates that a complicated sales pitch is less likely to succeed
  using asynchronous methods.
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