trea·ty n pl treaties [Anglo-French treté, from Middle French traité, from Medieval Latin tractatus, from Latin, handling, treatment, from tractare to treat, handle]
1: the action of treating and esp. of negotiating
2: an agreement or arrangement made by negotiation: as
b: a contract in writing between two or more political authorities (as states or sovereigns) formally signed by representatives duly authorized and usu. ratified by the lawmaking authority of the state
the president...shall have power, by and with the advice and consent of the Senate, to make treaties — U.S. Constitution art. II compare executive agreement
3: a document embodying a negotiated agreement or contract
4: an agreement or contract (as between companies) providing for treaty reinsurance
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.