/ ˌsɪmlˈteɪniəs; NAmE ˌsaɪml-/ adjective
happening or done at the same time as sth else :
There were several simultaneous attacks by the rebels.
simultaneous translation / interpreting
► sim·ul·tan·eity / ˌsɪmltəˈneɪəti; NAmE ˌsaɪmltəˈniːəti/ noun [ U ]
► sim·ul·tan·eous·ly adverb :
The game will be broadcast simultaneously on TV and radio.
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WORD ORIGIN
mid 17th cent.: based on Latin simul at the same time, probably influenced by late Latin momentaneus .