THENCEFORTH Meaning of THENCEFORTH in English thence ‧ forth /ðensˈfɔːθ $ ˈðensfɔːrθ/ BrE AmE ( also thence‧forward /ðensˈfɔːwəd $ -ˈfɔːrwərd/) adverb formal starting from that time ⇨ henceforth Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012