1. An unproved statement put forward as a premise in an argument
   "His thesis was that economic factors were the primary cause of the war"
    
2. A treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree
   "He spent two years writing his thesis on climate change impacts";
   - dissertation

Derived forms: theses

Type of: assumption, premise, premiss, treatise

Encyclopedia: Thesis, antithesis, synthesis