third-party

adjective

Definition of third-party

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

First Known Use of third-party

1901


third party

noun

Definition of third party

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

First Known Use of third party

1641


THIRD-PARTY Defined for English Language Learners

third-party

adjective

Definition of third-party for English Language Learners

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


third party

noun

Definition of third party for English Language Learners

  • 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


Law Dictionary

third party

legal Definition of third party

see party 1a, b

Learn More about third-party


Seen and Heard

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

Love words? Need even more definitions?

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

WORD OF THE DAY

of yeast or being unsettled or frivolous

Get Word of the Day daily email!

Test Your Vocabulary

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

  • young-plant-shoots
  • Which of the following is a new sense of the word bunny?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Word Winder's CrossWinder

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

TAKE THE QUIZ

Love words? Need even more definitions?

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