third-party

1 of 2

adjective

third-par·​ty ˈthərd-ˈpär-tē 

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

2 of 2

noun

1

: a person other than the principals

a third party to a divorce proceeding

insurance against injury to third parties

2

a

: 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

b

: minor party

Examples of third-party in a Sentence

Recent Examples on the Web

Adjective

Furthermore, Android 17 introduces mandatory developer identity verification for third-party apps, positioning the Google Play Store as a strict gatekeeper and restricting sideloading. — Ewan Spence, Forbes.com, 9 Aug. 2026

The race has intensified in the final 10 days as outside, third-party groups are pouring millions of dollars into the race. — Christopher Keating, Hartford Courant, 9 Aug. 2026

Noun

Puhm, who was most recently Head of Dream Lab LA at Luma AI, is now developing and producing AI-native and hybrid productions and will also carry out work for third parties and brands. — Andreas Wiseman, Deadline, 13 Aug. 2026

Because supplements don't have to undergo FDA approval for safety or effectiveness before being sold, Wood also recommends looking for products independently tested by a reputable third party. — Dr. Onaola Adedeji, ABC News, 13 Aug. 2026

Word History

First Known Use

Adjective

1901, in the meaning defined at sense 1

Noun

1641, in the meaning defined at sense 1

Kids Definition

third party

noun

1

: a person other than the main participants

a third party to the legal proceedings

2

a

: a political party operating usually for a limited time in addition to the two major parties in a 2-party system

b

: minor party

Legal Definition

third party

see also:

party sense 1a, b