adv. 25B6; adverb PREVIOUSLY, formerly, earlier, before, beforehand; so far, thus far, to date, as yet, until now, until then, till now, till then, up to now, up to then; formal heretofore.
HITHERTO
Meaning of HITHERTO in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012