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

1300–50; Middle English tretis < Anglo-French tretiz, akin to Old French traitier to treat Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
treatise (ˈtriːtɪz)
1.  a formal work on a subject, esp one that deals systematically with its principles and conclusions
2.  an obsolete word for narrative
[C14: from Anglo-French tretiz, from Old French tretier to treat]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1300, from Anglo-Fr. tretiz (c.1250), contracted from O.Fr. traiteiz, from Gallo-Romance *tractaticius, from L. tractare "to deal with" (see treat).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
So what this thread has turned into is a treatise on elitism.
The treatise itself begins with entire propriety by defining the science which
  it is to present.
But this is no dry academic treatise on observing animals in the wild.
Largely a scholarly treatise, the book sets out to explore what gossip is, how
  it works and how it has changed over the centuries.
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