What is the etymological meaning of Thesis?
The term thesis comes from the Greek word θέσις, meaning something put forth, and refers to an intellectual proposition. Dissertation comes from the Latin dissertātiō, meaning discussion.

In academic contexts, thesis came to refer to a specific type of proposition or argument that is advanced and defended by a student as part of their degree program, typically at the master's or doctoral level. Over time, the term has come to be used more broadly to refer to any central idea or statement that is put forward for consideration or debate. 

In the introductory paragraph of a paper a thesis offers a concise summary of the main point or claim of the essay, research paper, etc. It is usually expressed in one sentence, and the statement may be reiterated elsewhere
Is there any relation between thesis and theseus?