• synonyms


[sing-kruh-nuh s]
  1. occurring at the same time; coinciding in time; contemporaneous; simultaneous.
  2. going on at the same rate and exactly together; recurring together.
  3. Physics, Electricity. having the same frequency and zero phase difference.
  4. Computers, Telecommunications. of, relating to, or operating using fixed-time intervals controlled by a clock (opposed to asynchronous).
  5. Aerospace. geostationary.
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Origin of synchronous

1660–70; < Late Latin synchronus < Greek sýnchronos, equivalent to syn- syn- + chrón(os) time + -os adj. suffix; see -ous
Related formssyn·chro·nous·ly, adverbsyn·chro·nous·ness, nounnon·syn·chro·nous, adjectivenon·syn·chro·nous·ly, adverbnon·syn·chro·nous·ness, nounun·syn·chro·nous, adjectiveun·syn·chro·nous·ly, adverbun·syn·chro·nous·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for nonsynchronous


  1. occurring at the same time; contemporaneous
  2. physics (of periodic phenomena, such as voltages) having the same frequency and phase
  3. occurring or recurring exactly together and at the same ratethe synchronous flapping of a bird's wings
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Derived Formssynchronously, adverbsynchronousness, noun

Word Origin for synchronous

C17: from Late Latin synchronus, from Greek sunkhronos, from syn- + khronos time
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for nonsynchronous



1660s, "existing or happening at the same time," from Late Latin synchronus "simultaneous," from Greek synchronos "happening at the same time," from syn- "together" (see syn-) + khronos "time" (see chrono-). Meaning "recurring at the same successive instants of time" is attested from 1670s.

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Online Etymology Dictionary, © 2010 Douglas Harper

nonsynchronous in Medicine


(sĭngkrə-nəs, sĭn-)
  1. Occurring or existing at the same time.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.