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asynchronous

[ey-sing-kruh-nuh s]
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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 relating to operation without the use of fixed time intervals (opposed to synchronous).
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Origin of asynchronous

First recorded in 1740–50; a-6 + synchronous
Related formsa·syn·chro·nous·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for asynchronous

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper