thesis Pronunciation: /ˈθiːsɪs/Translate thesis | into German | into Italian | into Spanish French translation of thesisn (pl theses) 1 [Univ] (doctoral) thèse (f); (master's) mémoire (m) 2 (theory) thèse (f)thesis in other Oxford dictionaries Definition of thesis in the British & World English dictionary Definition of thesis in the US English dictionary