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Definition of dissertation : A formal or elaborate argumentative discourse, oral or written; a disquisition; an essay; a discussion; as, Dissertations on the Prophecies.

Synonyms:

speaking, speech, address, disquisition, oratory, discourse, sermon, oration, harangue, utterance, language, treatise, words, talk

contention, examination, interpolation, article, discussion, thesis, position, assertion, argument, hypothesis, research, commentary, criticism, analysis, conjecture, postulation, opinion, premise, essay, critique

inference, principle, text, question, theorem, idea, concept, point, subject, assumption, theme, matter, presumption, issue, basis, problem, consideration, statement, paradigm, exposition, motif, topic, belief, axiom, query

Usage examples:

• Unfortunately, either the explanations were faulty or his comprehension dull as each time he came he wanted the whole dissertation over again until at last our patience was fairly exhausted, and we gave him up as a bad job. - "A Narrative of Captivity in Abyssinia With Some Account of the Late Emperor Theodore, His Country and People", Henry Blanc.
• In 1796, St. George Tucker, of Virginia, professor of law in the University of William and Mary, and Judge of the General Court, published a dissertation on slavery, urging the abolition of slavery by law. - "The Anti-Slavery Examiner, Omnibus", American Anti-Slavery Society.
• I want to read over the dissertation, excuse me, Franzel. - "The Children of the World", Paul Heyse.