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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, cooccurring

See also: simultaneously, simultaneousness, synchronal, synchronic, synchronous

Encyclopedia: Simultaneous