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.
ᅳsimultaneously adverb The opera will be broadcast simultaneously on television and radio.