Definition of hitherto adverb from the Oxford Advanced Learner's Dictionary

 

hitherto

 adverb
adverb
BrE BrE//ˌhɪðəˈtuː//
 
; NAmE NAmE//ˌhɪðərˈtuː//
 
(formal)
 
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until now; until the particular time you are talking about a hitherto unknown species of moth Her life hitherto had been devoid of adventure.
See the Oxford Advanced American Dictionary entry: hitherto