Meaning of “simultaneous” - Learner’s Dictionary

simultaneous

adjective uk us /ˌsɪməlˈteɪniəs/

If two or more things are simultaneous, they happen or exist at the same time:

simultaneous translation
simultaneously adverb

B2

It was broadcast simultaneously in Britain and France.

(Definition of “simultaneous” from the Cambridge Learner’s Dictionary © Cambridge University Press)