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simultaneous (EN)
adjective

adjective “simultaneous”

base form simultaneous, non-gradable
  1. occurring at the exact same time as another event
    The thunder and lightning were simultaneous, making the storm very intense.
  2. (in mathematics, referring to a group of equations) to be solved using the same numerical values for their variables
    We need to solve these simultaneous equations to find the values of x and y.