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, pertaining to, or operating using fixed-time intervals controlled by a clock (opposed to asynchronous ).
Aerospace. geostationary.

1660–70; < Late Latin synchronus < Greek sýnchronos, equivalent to syn- syn- + chrón(os) time + -os adj. suffix; see -ous

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. 2014.
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World English Dictionary
synchronous (ˈsɪŋkrənəs)
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 rate: the synchronous flapping of a bird's wings
[C17: from Late Latin synchronus, from Greek sunkhronos, from syn- + khronos time]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1669, "existing or happening at the same time," from L.L. synchronus "simultaneous," from Gk. synchronos "happening at the same time," from syn- "together" + khronos "time." Meaning "recurring at the same successive instants of time" is attested from 1677.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Example sentences
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.
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