Word parts duplicate + -ion Pronunciation (UK) IPA (key): /djuː.plɪˈkeɪ.ʃən/ or /dʒuː.plɪˈkeɪ.ʃən/ (US) IPA (key): /d(j)u.plɪˈkeɪ.ʃən/ Audio (UK)(file) Noun Singular duplication Plural duplications (countable & uncountable) Duplication is the act of duplicating something.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads