Definition of treatise noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈtriːtɪs//
; NAmE NAmE//ˈtriːtɪs//
; BrE BrE//ˈtriːtɪz//
; NAmE NAmE//ˈtriːtɪz//
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treatise (on something) (formal) a long and serious piece of writing on a particular subject ‘A Treatise of Human Nature’ by David Hume Any of these questions would deserve a lengthy treatise, perhaps even a small book. Word Originlate Middle English: from Anglo-Norman French tretis, from Old French traitier, from Latin tractare ‘handle’, frequentative of trahere ‘draw, pull’.
See the Oxford Advanced American Dictionary entry: treatise