American English

Definition of henceforth adverb from the Oxford Advanced American Dictionary

 

henceforth

 adverb
adverb
NAmE//ˈhɛnsfɔrθ//
 
, NAmE//ˌhɛnsˈfɔrθ//
 
(also henceforward
NAmE//ˌhɛnsˈfɔrwərd//
 
)
(formal)
 
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starting from a particular time and at all times in the future Tuesday, October 29, 1929 was henceforth known as “Black Tuesday.” Henceforth, all personnel will need to provide proof of identity before entering the building.
See the Oxford Advanced Learner's Dictionary entry: henceforth