whenceforth UK /ˈwɛnsˌfɔːθ/US /ˈ(h)wɛnsˌfɔɹθ/ adverb2 •(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) Forth from what place, time, or point; onward from what place, time, or point.Whenceforth ought we to maintain radio-silence?