HITHERTO


Meaning of HITHERTO in English

/ ˌhɪðəˈtuː; NAmE ˌhɪðərˈtuː/ adverb

( formal ) until now; until the particular time you are talking about :

a hitherto unknown species of moth

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.