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[sing-kruh-nuh s] /ˈsɪŋ krə nəs/
occurring at the same time; coinciding in time; contemporaneous; simultaneous.
going on at the same rate and exactly together; recurring together.
Physics, Electricity. having the same frequency and zero phase difference.
Computers, Telecommunications. of, relating to, or operating using fixed-time intervals controlled by a clock (opposed to asynchronous).
Aerospace. geostationary.
Origin of synchronous
1660-70; < Late Latin synchronus < Greek sýnchronos, equivalent to syn- syn- + chrón(os) time + -os adj. suffix; see -ous
Related forms
synchronously, adverb
synchronousness, noun
nonsynchronous, adjective
nonsynchronously, adverb
nonsynchronousness, noun
unsynchronous, adjective
unsynchronously, adverb
unsynchronousness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for synchronously
  • Whether heightened tolerance is due specifically to rowing synchronously remains unclear.
  • The experimenter then stroked both the obscured real hand and the visible fake hand synchronously.
  • It can be compared to a cosmic movie where atoms everywhere appear and disappear synchronously.
  • It is a master sensorium or memory bank from which physical forms are synchronously recalled in successive still frames.
British Dictionary definitions for synchronously


occurring at the same time; contemporaneous
(physics) (of periodic phenomena, such as voltages) having the same frequency and phase
occurring or recurring exactly together and at the same rate: the synchronous flapping of a bird's wings
Derived Forms
synchronously, adverb
synchronousness, noun
Word Origin
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
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Word Origin and History for synchronously



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.

Online Etymology Dictionary, © 2010 Douglas Harper
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synchronously in Medicine

synchronous syn·chro·nous (sĭng'krə-nəs, sĭn'-)
Occurring or existing at the same time.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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