Etymology
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treaty (n.)

late 14c., "treatment, discussion," from Anglo-French treté, Old French traitié "assembly, agreement, dealings," from Latin tractatus "discussion, handling, management," from tractare "to handle, manage" (see treat (v.)). Sense of "contract or league between nations or sovereigns" is first recorded early 15c.

updated on February 16, 2014

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Definitions of treaty from WordNet

treaty (n.)
a written agreement between two states or sovereigns;
Synonyms: pact / accord
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.