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

• accord
• alliance
• compact
• convention
• covenant
• pact

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

The treaty was signed in Washington D.C., in April 1949. —Arthur I. Cyr, Chicago Tribune, 19 Feb. 2025

By inviting Beijing to negotiations, Trump could test China’s goodwill and, if an agreement is reached, make sure that China has a stake in implementing a cease-fire. February 2025 marks the 75th anniversary of the signing of the Sino-Soviet treaty of alliance. —Sergey Radchenko, Foreign Affairs, 18 Feb. 2025

President Trump has withdrawn the United States from the Paris Agreement, an international treaty on climate change that aims to slow global temperature increases. —Dave Cortese, The Mercury News, 13 Feb. 2025

Signed in 2016, the international climate treaty set a limit to keep global surface temperatures from rising 1.5 degrees Celsius (C) (2.7 Fahrenheit) above pre-industrial levels, but two new studies warn that the world may be on its way to failing this critical test. —Jack Knudson, Discover Magazine, 12 Feb. 2025

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

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