thesis

noun
UK /ˈθiːsɪs/
US /ˈθiːsɪs/

A thesis is the main idea that you explain and try to prove in a piece of writing.

Her thesis was that school should start later in the morning.


OTHER MEANINGS

2. A long piece of writing that a student does for a university degree.

He spent two years writing his doctoral thesis.

3. A statement or idea that someone puts forward and then supports with reasons.

The scientist defended her thesis at the conference.

4. In logic, a statement that is put forward to be proved.

The debate began with a bold thesis about human nature.