adv. 25B6; adverb AT (ONE AND) THE SAME TIME, at the same instant/moment, at once, concurrently, concomitantly; (all) together, in unison, in concert, in chorus.
SIMULTANEOUSLY
Meaning of SIMULTANEOUSLY in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012