supplement Pronunciation: /ˈsʌplɪmənt/Translate supplement | into French | into Italian | into Spanish German translation of supplementA. n. 1 Ergänzung (to) (+ Gen.); (addition) Zusatz 2 (of book) Nachtrag; (of newspaper) Beilage 3 (to fare) ZuschlagB. v.t. ergänzensupplement in other Oxford dictionaries Definition of supplement in the British & World English dictionary Definition of supplement in the US English dictionary