Treatise
Easton’s Bible Dictionary & Webster’s 1828 Dictionary · Matthew George Easton, Noah Webster
Treatise - (Webster's 1828 Dictionary)
TRE'ATISE, n. [L. tractatus.] A tract; a written composition on a particular subject, in which the principles of it are discussed or explained. A treatise is of an indefinite length; but it implies more form and method than an essay, and less fullness or copiousness than a system.
Source of the article
Matthew George Easton, Easton’s Bible Dictionary; Noah Webster, American Dictionary of the English Language (1828)
Bible Strong combined digital edition