third-par·​ty | \ ˈthərd-ˈpär-tē How to pronounce third-party (audio) \

Definition of third-party

 (Entry 1 of 2)

1 : of, relating to, or involving a third party third-party insurance
2 : of, relating to, or being software that is created by a vendor to be compatible with the products of another vendor

third party


Definition of third party (Entry 2 of 2)

1 : a person other than the principals a third party to a divorce proceeding insurance against injury to third parties
2a : a major political party operating over a limited period of time in addition to two other major parties in a nation or state normally characterized by a two-party system

Examples of third-party in a Sentence

Recent Examples on the Web: Noun

When managing cost is in the hands of a third party such as Medicare or another insurer, profound waste is inevitable. WSJ, "Third-Party Payers Muddy Drug Incentives," 10 Jan. 2019 Most of those who have contacted her have actual fund-raising needs but have been scammed by third parties—users who set up unauthorized campaigns in other people’s names and then make off with the money. Nathan Heller, The New Yorker, "The Perverse Logic of GoFundMe Health Care," 24 June 2019 The program is managed by a third party, ZipLine, that specializes in payment and store loyalty programs., "Is it safe to link Giant Eagle card to checking account for gas discounts? — Money Matters," 23 June 2019 Companies work around them, diverting shipments through third parties for a minor brokerage commission mark-up. Ken Fisher, USA TODAY, "Why rising gas prices won't last, even after Trump ends Iran nuclear deal," 20 May 2018 Currently, only some are available to the public, and mostly through third parties. Tara Golshan, Vox, "4 winners and 4 losers from Congress’s massive $1.3 trillion spending package," 23 Mar. 2018 Barrios was ordered to have no contact with anyone under the age of 18 and have no contact with the victim, including on social media or through third parties. Rosemary Sobol,, "Prosecutors: Kennedy-King lifeguard accused of sexually abusing student," 16 Mar. 2018 Others seek refunds for products that have been purchased through third parties, such as at yard sales. Tiffany Hsu, New York Times, "L.L. Bean, Citing Abuse, Tightens Its Generous Policy on Returns," 9 Feb. 2018 Those payments allegedly were hidden by being passed them through third parties, according to Ukrainian leaders. Philip Bump, Washington Post, "A (so far) complete timeline of the investigation into Trump and Russia," 5 Feb. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'third-party.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of third-party


1901, in the meaning defined at sense 1


1641, in the meaning defined at sense 1

Keep scrolling for more

Learn More about third-party

Statistics for third-party

Look-up Popularity

Time Traveler for third-party

The first known use of third-party was in 1641

See more words from the same year

Keep scrolling for more

More Definitions for third-party



English Language Learners Definition of third-party

 (Entry 1 of 2)

law : of, relating to, or involving insurance that pays money to someone who is harmed by your actions

third party


English Language Learners Definition of third party (Entry 2 of 2)

law : someone who is not one of the two main people involved in a legal agreement but who is still affected by it in some way

third party

Legal Definition of third party

see party sense 1a, b

More from Merriam-Webster on third-party

Rhyming Dictionary: Words that rhyme with third-party

Comments on third-party

What made you want to look up third-party? Please tell us where you read or heard it (including the quote, if possible).


to form ideas or theories about something

Get Word of the Day daily email!

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!