thesis Pronunciation: /ˈθiːsɪs/Translate thesis | into French | into Italian | into Spanish German translation of thesisn. (pl. theses /ˈθiːsiːz/) 1 (proposition) These 2 (dissertation) Dissertation (on über) (+ Akk.)thesis in other Oxford dictionaries Definition of thesis in the British & World English dictionary Definition of thesis in the US English dictionary