trea·tise

[tree-tis]
noun
a formal and systematic exposition in writing of the principles of a subject, generally longer and more detailed than an essay.

Origin:
1300–50; Middle English tretis < Anglo-French tretiz, akin to Old French traitier to treat

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World English Dictionary
treatise (ˈtriːtɪz) [Click for IPA pronunciation guide]
 
n
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
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00:10
Treatise is always a great word to know.
So is lollapalooza. Does it mean:
a scrap or morsel of food left at a meal.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Etymonline
Word Origin & History

treatise
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
These were scientists, and they wrote an actual treatise on how long it would
  take for humanity to be wiped out by zombies.
Largely a scholarly treatise, the book sets out to explore what gossip is, how
  it works and how it has changed over the centuries.
So what this thread has turned into is a treatise on elitism.
In other words, it is as literature and not as a scientific treatise that ideal
  commonwealths should be considered.
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