D defs.my
Entry 1 sense Webster, 1913

Dissertation

/dĭsˌ-ẽrt-āsh'-ən/ · Dis·ser·ta·tion · IPA /ˌdɪsɚˈteɪʃən/
01 n. A formal or elaborate argumentative discourse, oral or written; a disquisition; an essay; a discussion; as, Dissertations on the Prophecies.
  1. 1.
    A formal or elaborate argumentative discourse, oral or written; a disquisition; an essay; a discussion; as, Dissertations on the Prophecies.