dissertation

US /ˌdɪs.ɚˈteɪ.ʃən/
UK /ˌdɪs.ɚˈteɪ.ʃən/
"dissertation" picture
1.

a long essay on a particular subject, especially one written as a requirement for a university degree or diploma

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She spent a year writing her doctoral dissertation.
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His master's dissertation focused on medieval history.
:
thesistreatisemonographessaypaper