Etymology

treatise

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Today it means: A formal, usually lengthy, systematic discourse on some subject. Full definition →

Middle English tretys ← Anglo-Norman tretiz ← Old French traitis
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The story

  1. Old French · derived fromtraitis“treatise, account”
  2. Anglo-Norman · derived fromtretiz
  3. Middle English · inherited fromtretys
  4. English todaytreatise

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

Etymology from Wiktionary, CC BY-SA 4.0.