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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 synchronous
  • The rest of nature is more synchronous when it comes to being born.
  • Real-time and speedy synchronous and asynchronous communication options abound.
  • The rotor's magnetic field is rotating at the same speed as that of the stator, as in a synchronous machine.
  • The duo's gravity puts them in a synchronous orbit, which means they face each other with the same side all the time.
  • Normally, brain activity is synchronous across this circuit's three regions.
  • It's rear-wheel drive, and those wheels are powered by a synchronous motor mounted in the differential housing.
  • As the lights came up, the crowd burst into the synchronous cacophony otherwise known as applause.
  • It is implicit in the primary synchronous projection of atomic matter everywhere at once.
  • In synchronous computers, the clock's basic pace must be slow enough to accommodate the slowest action within the group.
  • My path is to become a learning facilitator for synchronous online adult education.
British Dictionary definitions for synchronous


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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for synchronous

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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synchronous 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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synchronous in Technology

operating system, communications
1. Two or more processes that depend upon the occurrences of specific events such as common timing signals.
2. Occurring at the same time or at the same rate or with a regular or predictable time relationship or sequence.
Opposite: asynchronous.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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