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English definition of “thenceforth”

thenceforth

adverb uk   /ˌðensˈfɔːθ/ us    /-ˈfɔːrθ/ (also thenceforward) old-fashioned or formal
after that; from that time forward: The property was known thenceforth as The Manor.Starting from a particular time
(Definition of thenceforth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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