treaty

noun

trea·​ty ˈtrē-tē 

plural treaties

1

a

: an agreement or arrangement made by negotiation:

(1)

: a contract in writing between two or more political authorities (such as states or sovereigns) formally signed by representatives duly authorized and usually ratified by the lawmaking authority of the state

(2)

: private treaty

b

: a document in which such a contract is set down

2

: the action of treating and especially of negotiating

Synonyms of treaty

• pact
• convention
• accord

Examples of treaty in a Sentence

a nuclear test ban treaty

in accordance with a treaty between the United States and the tribes of the Pacific Northwest, commercial fishing of certain kinds of salmon is limited to Native Americans

Recent Examples on the Web

Nine days after Marshall’s discovery — at the conclusion of the Mexican-American War — the United States had been granted this land as part of a treaty. —Kurt Snibbe, Oc Register, 24 Jan. 2026

Several years later in 1871, Whipple went to bat again for the rights of the Ojibwe and Dakota people when the US wanted to end treaties with Native Americans, McNally said. —Elise Hammond, CNN Money, 23 Jan. 2026

That Iraq border was not officially ratified by treaty until 1974. —Melik Kaylan, Forbes.com, 22 Jan. 2026

But research later determined that the neurotoxic gas also can cause serious health issues in humans and contributed to the depletion of the ozone, ultimately leading to its ban under the Montreal Protocol, an international treaty, in 2005. —Tony Briscoe, Los Angeles Times, 22 Jan. 2026

Word History

Etymology

Middle English trete, from Anglo-French treté, from past participle of treter to discuss, treat

First Known Use

14th century, in the meaning defined at sense 2

Phrases Containing treaty

• nonaggression pact/treaty
• nonaggression treaty/pact
• peace treaty
• private treaty
• treaty port

Rhymes for treaty

• beati
• beaty
• meaty
• peaty
• smriti
• sweetie
• banditti
• cochiti
• entreaty
• graffiti
• wapiti

Kids Definition

treaty

noun

trea·​ty ˈtrēt-ē 

plural treaties

: an agreement or arrangement made by negotiation

especially : one between two or more states or rulers

Legal Definition

treaty

noun

trea·​ty

plural treaties

1

: the action of treating and especially of negotiating

2

: an agreement or arrangement made by negotiation: as

a

: private treaty

b

: a contract in writing between two or more political authorities (as states or sovereigns) formally signed by representatives duly authorized and usually 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

Etymology

Anglo-French treté, from Middle French traité, from Medieval Latin tractatus, from Latin, handling, treatment, from tractare to treat, handle