[ tree-tis ]
/ ˈtri tɪs /


a formal and systematic exposition in writing of the principles of a subject, generally longer and more detailed than an essay.

Nearby words

  1. treasury stock,
  2. treasury tag,
  3. treat,
  4. treat like dirt,
  5. treatable,
  6. treatment,
  7. treaty,
  8. treaty indian,
  9. treaty port,
  10. trebbia

Origin of treatise

1300–50; Middle English tretis < Anglo-French tretiz, akin to Old French traitier to treat Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for treatise

British Dictionary definitions for treatise


/ (ˈtriːtɪz) /


a formal work on a subject, esp one that deals systematically with its principles and conclusions
an obsolete word for narrative

Word Origin for treatise

C14: from Anglo-French tretiz, from Old French tretier to treat

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for treatise



c.1300, from Anglo-French tretiz (mid-13c.), contracted from Old French traiteiz, from Gallo-Romance *tractaticius, from Latin tractare "to deal with" (see treat).

Online Etymology Dictionary, © 2010 Douglas Harper