Definition of “simultaneous” - English Dictionary

“simultaneous” in British English

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simultaneousadjective

uk /ˌsɪm.əlˈteɪ.ni.əs/ us /ˌsaɪ.məlˈteɪ.ni.əs/
simultaneously
adverb uk /ˌsɪm.əlˈteɪ.ni.əs.li/ us /ˌsaɪ.məlˈteɪ.ni.əs.li/

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B2

Two children answered the teacher's question simultaneously.
simultaneousness
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.
simultaneously
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)