Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Medieval Latin
Origin: simultaneus, from Latin simul 'at the same time'

simultaneous

 adjective
     
sim‧ul‧ta‧ne‧ous
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.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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