- a formal and systematic exposition in writing of the principles of a subject, generally longer and more detailed than an essay.
Origin of treatise
1300–50; Middle English tretis < Anglo-French tretiz, akin to Old French traitier to treat
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for treatises
And have you not also met with the treatises of philosophers who say that like must love like?Lysis
Read on this subject the learned reply of Father Balthus to the treatises of MM.The Phantom World
Altogether there are some dozen treatises from these three men on chemical subjects.
Altogether he wrote some eighteen treatises on chemical subjects.
Then there were treatises on grammar, on orthography, and a series of works on mathematics.
- a formal work on a subject, esp one that deals systematically with its principles and conclusions
- an obsolete word for narrative
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 treatises
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