what does thesis mean?

like what i want to know is whether it is only a sentence or a paragraph?

A thesis is usually one sentence. Check this site for more information.

http://www.unc.edu/depts/wcweb/handouts/thesis.html

The thesis in an essay is a sentence stating what you intend to "proove" in your essay. It does not have to be in the first paragraph, but must be there somewhere. For example, WHY are you writing this essay in the first place?

Sra

The term "thesis" can refer to a couple of different things. In an academic context, a thesis usually refers to a statement or an argument that is presented in a written paper or essay. It is generally a single sentence that sums up the main idea or the central point of the entire paper.

However, in another sense, a thesis can also refer to a more extensive work, such as a master's thesis or a doctoral dissertation. In this case, a thesis is a longer document that typically consists of multiple chapters or sections, where the author explores a specific research topic in depth and presents their original findings.

So, to answer your question, a thesis can be both a single sentence that serves as the main argument of an essay, or a longer comprehensive document that presents research findings. It depends on the context and the type of work being referred to.