dissertation

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

disertación, tesis

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

:
She spent a year writing her doctoral dissertation.
Pasó un año escribiendo su tesis doctoral.
His master's dissertation focused on medieval history.
Su tesis de maestría se centró en la historia medieval.