sim ‧ ul ‧ ta ‧ ne ‧ ous /ˌsɪm ə lˈteɪniəs◂ $ ˌsaɪ-/ BrE AmE adjective
[ Date: 1600-1700 ; Language: Medieval Latin ; Origin: simultaneus , from Latin simul 'at the same time' ]
things that are simultaneous happen at exactly the same time:
They grabbed each other’s hands in simultaneous panic.
Up to twenty users can have simultaneous access to the system.
simultaneous with
The withdrawal of British troops should be simultaneous with that of US forces.
The speeches will be broadcast live, with simultaneous translation (=immediate translation, as the person is speaking) into English.
—simultaneously adverb :
The opera will be broadcast simultaneously on television and radio.
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In everyday English, people often say that two things happen at the same time , rather than say that they are simultaneous :
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Up to twenty people can use the system at the same time.