dissertation

/ˌdɪsəˈteɪʃən/

IPA: /D IH0 S ER0 T EY1 SH AH0 N/

noun
  1. 1

    A formal exposition of a subject, especially a research paper that students write in order to complete the requirements for a doctoral degree; a thesis.

  2. 2

    A lengthy lecture on a subject; a treatise; a discourse; a sermon.

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Source: https://en.wiktionary.org/wiki/dissertation