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From Medieval Latin simultaneus, from simultim (at the same time, extended), from Latin simul (together, at the same time); compare similar.


  • (UK) IPA(key): /sɪm.əlˈteɪ̯n.i.əs/
  • (US) IPA(key): /ˌsaɪ̯m.əlˈteɪ̯n.i.əs/
  • (file)
  • Rhymes: -eɪniəs
  • Rhymes: -eɪnɪəs


simultaneous (not comparable)

  1. Occurring or transpiring at the same moment.
    • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page 3-4:
      As with the Lejeuneaceae, this pattern of massive speciation appears to be correlated with the Cretaceous explosion of the angiosperms and the simultaneous creation of a host of new microenvironments, differing in humidity, light intensity, texture, etc.
  2. (mathematics, of a set of equations) To be solved for the same values of variables.


Derived termsEdit