noun. 1. with regard to logic, a proposition to be exposed to logical study in effort to establish proof or disproof. 2. more generally, any idea or proposition put forth within an argument. 3. with regard to philosophy, the initial phase of a dialectical process: a proposition which is opposed by an anti-thesis, thereby producing a new proposition called a synthesis. 4. a dissertation based upon unique research, particularly one needed for an advanced academic degree.
THESIS: "Several students wrote their thesis on the America government this semester."