[ dis-er-tey-shuh n ]
/ ˌdɪs ərˈteɪ ʃən /


a written essay, treatise, or thesis, especially one written by a candidate for the degree of Doctor of Philosophy.
any formal discourse in speech or writing.

Origin of dissertation

1605–15; < Latin dissertātiōn- (stem of dissertātiō), equivalent to dissertāt(us) (past participle of dissertāre; dissert- (see dissert) + -ātus -ate1) + -iōn- -ion

Related forms

dis·ser·ta·tion·al, adjectivedis·ser·ta·tion·ist, noun

Can be confused

dissertation thesis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for dissertation

British Dictionary definitions for dissertation


/ (ˌdɪsəˈteɪʃən) /


a written thesis, often based on original research, usually required for a higher degree
a formal discourse

Derived Forms

dissertational, adjectivedissertationist, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012