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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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
When underwater, the animals pushed water past their gills while simultaneously
  pushing the glottis down.
They were both bright and sensitive artists, living simultaneously, two ways of
  life.
He was never at one side of a room and simultaneously at the other side of the
  same room.
The island seems marked in some unusual way, simultaneously favored and cursed.
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