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

 

thenceforth

 adverb
adverb
BrE BrE//ˌðensˈfɔːθ//
 
; NAmE NAmE//ˌðensˈfɔːrθ//
 
(also thenceforward
BrE BrE//ˌðensˈfɔːwəd//
 
; NAmE NAmE//ˌðensˈfɔːrwərd//
 
)
(old use or formal)
 
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starting from that time Thenceforth he became known as the Lord Protector.
See the Oxford Advanced American Dictionary entry: thenceforth