Simultaneous Definition

sīməl-tānē-əs, sĭməl-
Occurring, done, existing, etc. together or at the same time.
Webster's New World
Containing variables for which there are values that can satisfy all the equations.
Simultaneous equations.
American Heritage

Origin of Simultaneous

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

    From Wiktionary

  • Latin simul at the same time sem-1 in Indo-European roots English -taneous (as in instantaneous)

    From American Heritage Dictionary of the English Language, 5th Edition

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