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Adjective: simultaneous  ,sI-mul'tey-nee-us [N. Amer], ,si-mul'tey-nee-us [Brit]
  1. Occurring or operating at the same time
    "a series of simultaneous events";
    - coincident, coincidental, coinciding, concurrent, co-occurrent

See also: synchronal [archaic], synchronic, synchronous

Encyclopedia: Simultaneous