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treatise (noun) book or article on a subject.
A treatise is a serious piece of writing or a book on a subject. A treatise on physics, for example, is a book on physics, dealing with the subject in depth. A treatise on the practice of democracy is a piece of serious writing on the practice of democracy.
- Newton’s Principia is a treatise on physics. The book with all aspects of physics in a serious manner and is the result of a thorough study of the subject.
- The professor’s treatise on his subject did not impress many. They found the book on the subject very difficult to follow.