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thesis

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noun [countable] thesis pronunciation in American English /ˈθisɪs/ 
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singularthesis
pluraltheses
  1. 1
    a long piece of writing that is the final part of an advanced university degree
    thesis on:

    He wrote a doctoral thesis on the works of Carlo Crivelli.

  2. 2
    formal an idea, opinion, or theory that is used to explain something

    I don't agree with the central thesis of the article.

    someone's thesis (is) that:

    Research confirms her thesis that not all women enjoy shopping.

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