an unproved statement put forward as a premise in an argument
"His entire debate rested on that shaky thesis, which he had never actually proven to be true."
a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree
"After spending two years in the library, she finally submitted her thesis on climate migration to graduate school."
Senses relating to logic, rhetoric, etc.
"The professor challenged the student's thesis by pointing out a logical fallacy in the argument about free will."
A proposition or statement supported by arguments.
"The professor challenged my thesis that remote work increases productivity, arguing that I hadn't provided enough data to support such a bold claim."
In plain English: A thesis is the main point or argument that you are trying to prove in an essay or research paper.
"The student spent months writing her thesis on renewable energy before finally defending it in front of the committee."
The word thesis entered English in the Late Middle Ages with a dual meaning of both "lowering of the voice" and "proposition," directly borrowed from Latin. Its roots trace back to Ancient Greek, where it originally referred to an arrangement, placement, or conclusion before evolving into its modern academic sense.