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English definition of “simultaneous”

simultaneous

adjective [not gradable]  /ˌsɑɪ·məlˈteɪ·ni·əs, ˌsɪm·əl-/ us  
happening or existing at exactly the same time: The report will be broadcast in Russian with simultaneous English translation.
simultaneously
adverb [not gradable]  /ˌsɑɪ·məlˈteɪ·ni·əs·li, ˌsɪm·əl-/ us  
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)
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