treatise

[ tree-tis ]
/ ˈtri tɪs /

noun

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

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Origin of treatise

1300–50; Middle English tretis < Anglo-French tretiz, akin to Old French traitier to treat
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Example sentences from the Web for treatises

British Dictionary definitions for treatises

treatise
/ (ˈtriːtɪz) /

noun

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