thence·forth 
/ˈðɛnsˌfoɚθ/ adverb
/ˈðɛnsˌfoɚθ/ adverb formal : from that time forward : starting then
▪ He was determined thenceforth to dedicate himself to his studies. ▪ Thenceforth, she decided, she would deal with the media herself.
▪ He was determined thenceforth to dedicate himself to his studies. ▪ Thenceforth, she decided, she would deal with the media herself.
