Meaning of SIMULTANEOUS in English
adj. (often foll. by with) occurring or operating at the same time. simultaneous equations equations involving two or more unknowns that are to have the same values in each equation. simultaneity n. simultaneously adv. simultaneousness n.
[ med.L simultaneus f. L simul at the same time, prob. after instantaneus etc. ]
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012