Definition from Wiktionary, the free dictionary
whenceforth (not comparable)
- (formal) From which place, time, or point forth; forth from which; onward from which.
- With great reluctance, he was introduced to pomegranates, whenceforth he refused any other fruit.
- (formal, interrogative) Forth from what place, time, or point; onward from what place, time, or point.
- Whenceforth ought we to maintain radio-silence?