Definition of “simultaneous” - English Dictionary

“simultaneous” in British English

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uk /ˌsɪm.əlˈteɪ.ni.əs/ us /ˌsaɪ.məlˈteɪ.ni.əs/

C1 happening or being done at exactly the same time:

There were several simultaneous explosions in different cities.

More examples

  • There was a simultaneous trial taking place in the next building.
  • There were simultaneous cheers from several parts of the crowd.
  • A simultaneous translation was available through our headphones.
adverb uk /ˌsɪm.əlˈteɪ.ni.ə us /ˌsaɪ.məlˈteɪ.ni.ə


  • The opposing units opened fire simultaneously at close range and a 15-minute firefight ensued.
  • I was trying to do three things simultaneously.
  • She was cooking a meal while simultaneously holding a business meeting via her mobile phone.


Two children answered the teacher's question simultaneously.
noun [ U ] uk /ˌsɪm.əlˈteɪ.ni.əs.nəs/ us /ˌsaɪ.məlˈteɪ.ni.əs.nəs/ also simultaneity, uk /-təˈneɪ.ə.ti/ us /-təˈniː.ə.t̬i/

(Definition of “simultaneous” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“simultaneous” in American English

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simultaneousadjective [ not gradable ]

us /ˌsɑɪ·məlˈteɪ·ni·əs, ˌsɪm·əl-/

happening or existing at exactly the same time:

The report will be broadcast in Russian with simultaneous English translation.
adverb [ not gradable ] us /ˌsɑɪ·məlˈteɪ·ni·əs·li, ˌsɪm·əl-/

To drive a car, you’ve got to learn to do several things simultaneously.

(Definition of “simultaneous” from the Cambridge Academic Content Dictionary © Cambridge University Press)