Meaning of “thesis” in the English Dictionary

british dictionary

"thesis" in British English

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thesisnoun [ C ]

uk /ˈθiː.sɪs/ us /ˈθiː.sɪs/ plural theses uk /ˈθiː.siːz/ us

(Definition of “thesis” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"thesis" in American English

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thesisnoun [ C ]

us /ˈθi·sɪs/ plural theses /ˈθi·siz/

a piece of writing involving original study of a subject, esp. for a college or university degree:

a master’s thesis

A thesis is also the main idea, opinion, or theory of a speaker or writer, who then attempts to prove it:

His thesis was that World War I could have been avoided.

(Definition of “thesis” from the Cambridge Academic Content Dictionary © Cambridge University Press)