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[sahy-muh l-tey-nee-uh s, sim-uh l-] /ˌsaɪ məlˈteɪ ni əs, ˌsɪm əl-/
existing, occurring, or operating at the same time; concurrent:
simultaneous movements; simultaneous translation.
Origin of simultaneous
1650-60; < Latin simul together (see similar) + (instan)taneous
Related forms
simultaneously, adverb
simultaneousness, simultaneity
[sahy-muh l-tuh-nee-i-tee, sim-uh l-] /ˌsaɪ məl təˈni ɪ ti, ˌsɪm əl-/ (Show IPA),
nonsimultaneous, adjective
nonsimultaneously, adverb
unsimultaneous, adjective
unsimultaneously, adverb
unsimultaneousness, noun
synchronous, coincident. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for simultaneous
  • 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.
  • But the fact that they have the same source should not prejudice us in favor of a simultaneous origin.
  • Squads were told off and sent to make a simultaneous descent on all the known tramps' burrows in the block.
  • Globalisation is the more or less simultaneous marketing and sale of identical goods and services around the world.
  • Fiscal austerity robs policymakers of a potent antidote to a deflationary slump: simultaneous fiscal and monetary expansion.
  • The fashion is being driven by simultaneous developments in two usually distinct areas-health care and management theory.
  • Today the billions of people the world over who seek that prize are encountering simultaneous feast and famine.
British Dictionary definitions for simultaneous


/ˌsɪməlˈteɪnɪəs; US ˌsaɪməlˈteɪnɪəs/
occurring, existing, or operating at the same time; concurrent
(chess) a display in which one player plays a number of opponents at once, walking from board to board Sometimes shortened to simul
Derived Forms
simultaneously, adverb
simultaneousness, simultaneity (ˌsɪməltəˈniːɪtɪ; US) (ˌsaɪməltəˈniːɪtɪ) noun
Word Origin
C17: formed on the model of instantaneous from Latin simul at the same time, together
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for simultaneous

1650s, from Medieval Latin simultaneus, perhaps from simultim "at the same time," extended from Latin simul "at the same time" (see similar (adj.)), or from simul with ending abstracted from Late Latin spontaneus, where the -t- is organic. Related: Simultaneously.

Online Etymology Dictionary, © 2010 Douglas Harper
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