Meaning of SIMULTANEOUS in English

SIMULTANEOUS

adj. (often foll. by with) occurring or operating at the same time.

Phrases and idioms:

simultaneous equations equations involving two or more unknowns that are to have the same values in each equation.

Derivatives:

simultaneity n. simultaneously adv. simultaneousness n.

Etymology: med.L simultaneus f. L simul at the same time, prob. after instantaneus etc.

Oxford English vocab.      Оксфордский английский словарь.