say it: THEE-suhs
thesis is a noun meaning "an unproved statement put forward as a premise in an argument". It carries 2 recorded senses.
an unproved statement put forward as a premise in an argument
a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree
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 thesis 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.