[ADV 副词]迄今;到目前为止 You use hitherto to indicate that something was true up until the time you are talking about, although it may no longer be the case.
[ADV after v]
[FORMAL 正式]
The polytechnics have hitherto been at an unfair disadvantage in competing for pupils and money...
到目前为止,理工专科学校在争取生源和资金方面一直处于劣势。
Hitherto, the main emphasis has been on the need to resist aggression...
迄今为止,一直重点强调的是要抵抗侵略。
The helicopter is the first in the world to be designed to serve three hitherto very distinct markets.
这款直升机是世界上首批为满足3个迄今为止完全不同的市场而设计的机型。
Oxford
hith·er·to/ˌhɪðəˈtuː; NAmEˌhɪðərˈtuː/adverb( formal) until now; until the particular time you are talking about 迄今;直到某时◆a hitherto unknown species of moth迄今仍属未知品种的蛾hith·er·to/ˌhɪðəˈtuː; NAmEˌhɪðərˈtuː/