# treatise

> English word · Noun · IPA /ˈtɹiːtɪs/ · frequency rank #17,739

## Definitions
1. A formal, usually lengthy, systematic discourse on some subject.

## Etymology
From Middle English tretys, from Anglo-Norman tretiz and Old French traitis (“treatise, account”), from traitier (“to deal with, treat”).

## Easily confused with
- **treating** (https://plainspell.com/en/vs/treating-vs-treatise)
- **treaties** (https://plainspell.com/en/vs/treaties-vs-treatise)

## Common misspellings (10)
`rteatise`, `teratise`, `traetise`, `treaitse`, `treatisse`, `treatsie`, `treattise`, `tretaise`, `trreatise`, `ttreatise`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/treatise