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treatise

[tree-tis] /ˈtri tɪs/
noun
1.
a formal and systematic exposition in writing of the principles of a subject, generally longer and more detailed than an essay.
Origin of treatise
1300-1350
1300-50; Middle English tretis < Anglo-French tretiz, akin to Old French traitier to treat
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British Dictionary definitions for treatise

treatise

/ˈtriːtɪz/
noun
1.
a formal work on a subject, esp one that deals systematically with its principles and conclusions
2.
an obsolete word for narrative
Word Origin
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
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Word Origin and History for treatise
n.

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
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