counterparty

[ koun-ter-pahr-tee ]
/ ˈkaʊn tərˌpɑr ti /

noun, plural coun·ter·par·ties. Finance.

the other person or institution entering into a financial contract or transaction: the default of a counterparty.
Also con·tra·par·ty [kon-truh-pahr-tee] /ˈkɒn trəˌpɑr ti/.

Origin of counterparty

1980–85; counter- + party (in the legal sense “a signatory”)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for contraparty

counterparty

/ (ˈkaʊntəˌpɑːtɪ) /

noun plural -parties

a person who is a party to a contract
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