trea·ty 
(trētē)
(trētē)n. pl. trea·ties
1.
a. A formal written agreement between two or more nations.
b. The document in which such an agreement is set down.
2. Archaic Negotiation for the purpose of reaching an agreement.
3. Obsolete
a. A contract or agreement.
b. An entreaty.
[Middle English tretee, from Old French traite, from Latin tractātus, discussion, from past participle of tractāre, to drag about, deal with; see TREAT.]