treatise

noun

trea·​tise ˈtrē-təs 

also -təz

1

: a systematic exposition or argument in writing including a methodical discussion of the facts and principles involved and conclusions reached

a treatise on higher education

2

obsolete : account, tale

Examples of treatise in a Sentence

Recent Examples on the Web

The novel is not a political treatise. —David Frum, The Atlantic, 4 Feb. 2026

The text consists of 10 treatises on architecture, engineering and urban planning, and is the oldest surviving work written on the subject. —Andrea Margolis, FOXNews.com, 28 Jan. 2026

The Protestant theologian John Calvin began his writing career with a commentary on the ancient philosopher Seneca’s De clementia, a treatise addressed to Nero that insisted that a good ruler must take into account the perspectives of his subjects and act mercifully. —Bernadette Meyler, Harpers Magazine, 27 Jan. 2026

Ruffalo responded with a treatise of sorts on why the material resonates in his profession. —Chris Willman, Variety, 11 Jan. 2026

Word History

Etymology

Middle English tretis, from Anglo-French tretiz, alteration of tretez, traitet, from Medieval Latin tractatus, from Latin tractare to treat, handle

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for treatise

• fetus
• foetus
• meatus
• thetis
• caritas
• civitas
• cellulitis
• margaritas
• tonsillitis

Kids Definition

treatise

noun

trea·​tise ˈtrēt-əs 

: a book or article examining a subject carefully and completely