noun, plural trea·ties.

a formal agreement between two or more states in reference to peace, alliance, commerce, or other international relations.
the formal document embodying such an international agreement.
any agreement or compact.

Origin of treaty

1350–1400; Middle English trete < Anglo-French < Latin tractātus tractate
Related formsnon·trea·ty, noun, plural non·trea·ties. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for treaty


noun plural -ties

  1. a formal agreement or contract between two or more states, such as an alliance or trade arrangement
  2. the document in which such a contract is written
any international agreement
any pact or agreement
an agreement between two parties concerning the purchase of property at a price privately agreed between them
archaic negotiation towards an agreement
(in Canada)
  1. any of the formal agreements between Indian bands and the federal government by which the Indians surrender their land rights in return for various forms of aid
  2. (as modifier)treaty Indians; treaty money
an obsolete word for entreaty
Derived Formstreatyless, adjective

Word Origin for treaty

C14: from Old French traité, from Medieval Latin tractātus treaty, from Latin: discussion, from tractāre to manage; see treat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for treaty

late 14c., "treatment, discussion," from Old French traité "assembly, agreement, treaty," from Latin tractatus "discussion, handling," from tractare "to handle, manage" (see treat). Sense of "contract between nations" is first recorded early 15c.

Online Etymology Dictionary, © 2010 Douglas Harper