third party

2 ENTRIES FOUND:

third party

noun

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

Full 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
b :  minor party

First Known Use of THIRD PARTY

1641

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