1. A long essay or dissertation involving personal research, written by a candidate for a university degree
She wrote her doctoral thesis on climate change.
Ela escreveu sua tese de doutorado sobre mudanças climáticas.
2. A proposition or statement to be proved or discussed
The main thesis of the book is that education transforms society.
A tese principal do livro é que a educação transforma a sociedade.
3. A claim or argument put forward as a basis for discussion
His thesis challenges the conventional wisdom.
Sua tese desafia a sabedoria convencional.