/ ˌdɪsəˈteɪʃn; NAmE -sərˈt-/ noun
dissertation (on sth) a long piece of writing on a particular subject, especially one written for a university degree
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WORD ORIGIN
early 17th cent. (in the sense discussion, debate ): from Latin dissertatio(n-) , from dissertare continue to discuss, from disserere examine, discuss.