simultaneous : Idioms & Phrases
Simultaneous equations
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noun a set of equations in two or more variables for which there are values that can satisfy all the equations simultaneously
WordNet
(Alg.) , two or more equations in which the values of the unknown quantities entering them are the same at the same time in both or in all.
Webster 1913
simultaneous operation
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noun the simultaneous execution of two or more operations
parallel operation.