дисертация означава в английски

disquisition [disquisitions]▼(lengthy, formal discourse)
noun
[UK: ˌdɪ.skwɪ.ˈzɪʃ.n̩] [US: ˌdɪ.skwɪ.ˈzɪʃ.n̩]

dissertation [dissertations]▼(formal exposition of a subject)
noun
[UK: ˌdɪ.sə.ˈteɪʃ.n̩] [US: ˌdɪ.sər.ˈteɪʃ.n̩]

thesis [theses]▼(lengthy essay written to establish the validity of a thesis, especially one submitted as a requirement for a university degree)
noun
[UK: ˈθiːs.ɪs] [US: ˈθiːs.ɪs]