simultaneous

[sahy-muhl-tey-nee-uhs, sim-uhl-]
adjective
existing, occurring, or operating at the same time; concurrent: simultaneous movements; simultaneous translation.

Origin:
1650–60; < Latin simul together (see similar) + (instan)taneous

simultaneously, adverb
simultaneousness, simultaneity [sahy-muhl-tuh-nee-i-tee, sim-uhl-] , noun
nonsimultaneous, adjective
nonsimultaneously, adverb
unsimultaneous, adjective
unsimultaneously, adverb
unsimultaneousness, noun


synchronous, coincident.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
simultaneous (ˌsɪməlˈteɪnɪəs, US ˌsaɪməlˈteɪnɪəs)
 
adj
1.  occurring, existing, or operating at the same time; concurrent
 
n
2.  chess Sometimes shortened to: simul a display in which one player plays a number of opponents at once, walking from board to board
 
[C17: formed on the model of instantaneous from Latin simul at the same time, together]
 
simul'taneously
 
adv
 
simul'taneousness
 
n
 
simultaneity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

simultaneous
1650s, from L.L. simultaneus, from L. simul "at the same time" (see similar) + -taneous, abstracted from spontaneous, etc. Related: Simultaneously.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Also, the hypothesis of simultaneity is tested to determine if the two
  decisions are actually endogenous to each other.
They slosh out into a bog, and with inexplicable simultaneity, begin applauding
  wildly.
The sinister violence of the deaths, their astounding suddenness and
  gruesomeness and simultaneity, stamped them as horrific.
People found out about the tragedy in near simultaneity, and together watched
  the story evolve on television.
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