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
Political call and response become simultaneous, which implies an end of
  dialogue.
We're talking a major multi-agency, multi-criminal, simultaneous controlled
  buys in progress type operation.
Nudibranchs are simultaneous hermaphrodites, and can mate with any other mature
  member of their species.
But it is difficult to obtain this ray pure, on account of the simultaneous
  presence of other stars whose rays mingle with it.
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