Meaning & use
treatise
A long, formal piece of writing that deals systematically and thoroughly with a single subject.
See it in a sentence
Newton's treatise on motion and gravity changed the course of physics.
The lawyer consulted a classic treatise on contract law before drafting the brief.
A note on using this word
Treatise implies a serious, methodical academic or scholarly work, not a casual essay or article.
Words with a similar meaning
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