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simultaneous

si·mul·ta·ne·ous [ sm'l táynee əss, sìmm'l táynee əss ]


adjective 
Definition:
 
1. at same time: done, happening, or existing at the same time

2. taking same variables: describes equations that are satisfied by the same values of the variables

[Mid-17th century. < medieval Latin simultaneus< Latin simul "at the same time," probably after late Latin momentaneus "momentary"]

si·mul·ta·ne·i·ty [ sm'ltə n ətee, sìmm'l tə n ətee ] noun
si·mul·ta·ne·ous·ly [ sm'l táynee əsslee ] adverb
si·mul·ta·ne·ous·ness [ sm'l táynee əssnəss ] noun
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