IPA: /ˈtræk.teɪt/
KK: /trækˌteɪt/
A written work that discusses a specific subject in detail, often in the form of a formal essay or treatise.
The scholar published a tractate on the philosophy of ethics.
Tractate → It is formed from "tractare" (meaning to pull or draw) and the suffix "-ate" (indicating a state or condition). The word "tractate" refers to a written work that is drawn out or extended on a particular subject.
Think of 'drawing out' ('tractare') a discussion or topic in writing — that's why a tractate is a written work that explores a subject in detail.