Pronunciation: (thē'sis), [key]
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

Theseusthesis play
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