say it: dis-ur-TAY-shuhn
dissertation is a noun meaning "a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree". It is pronounced /ˌdɪsɚˈteɪʃən/ — dis-ur-TAY-shuhn. It carries one recorded sense.
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for dissertation come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.