si·mul·ta·ne·ous

[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

si·mul·ta·ne·ous·ly, adverb
si·mul·ta·ne·ous·ness, si·mul·ta·ne·i·ty [sahy-muhl-tuh-nee-i-tee, sim-uhl-] , noun
non·si·mul·ta·ne·ous, adjective
non·si·mul·ta·ne·ous·ly, adverb
un·si·mul·ta·ne·ous, adjective
un·si·mul·ta·ne·ous·ly, adverb
un·si·mul·ta·ne·ous·ness, noun


synchronous, coincident.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To simultaneity
00:10
Simultaneity is always a great word to know.
So is interrobang. Does it mean:
a chattering or flighty, light-headed person.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Collins
World English Dictionary
simultaneous (ˌsɪməlˈteɪnɪəs, US ˌsaɪməlˈteɪnɪəs) [Click for IPA pronunciation guide]
 
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

simultaneous (ˌsɪməlˈteɪnɪəs, US ˌsaɪməlˈteɪnɪəs) [Click for IPA pronunciation guide]
 
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
Cite This Source
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
Cite This Source
Example sentences
Since the two photons are traveling in the same reference frame, all of their
  events share simultaneity.
The simultaneity of these challenges poses an additional challenge for planning
  and policy-making in this dynamic system.
People found out about the tragedy in near simultaneity, and together watched
  the story evolve on television.
Also, the hypothesis of simultaneity is tested to determine if the two
  decisions are actually endogenous to each other.
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