Pronunciation: (thē'sis),[key] —n., —pl.-sesPronunciation: (-sēz).[key] 1. a proposition stated or put forward for consideration, esp. one to be discussed and proved or to be maintained against objections: He vigorously defended his thesis on the causes of war. 2. a subject for a composition or essay.
3. a dissertation on a particular subject in which one has done original research, as one presented by a candidate for a diploma or degree.
4. Music.the downward stroke in conducting; downbeat. Cf. arsis (def. 1).
5. Pros. a. a part of a metrical foot that does not bear the ictus or stress.
b. (less commonly) the part of a metrical foot that bears the ictus. Cf. arsis (def. 2).
6. Philos.See under Hegelian dialectic.