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simultaneous

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adjective simultaneous pronunciation in American English /ˌsaɪm(ə)lˈteɪniəs/
  1. happening or done at the same time

    In simultaneous announcements, the two men resigned from their jobs.

derived words

simultaneity

 simultaneous pronunciation in American English /ˌsaɪm(ə)ltəˈneɪəti/  noun [uncountable]

simultaneously

 simultaneous pronunciation in American English  adverb

a movie that opened simultaneously in the U.S. and in Europe

protologism

a new word or phrase invented in the hope that it will become generally used

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