Person besides the two primarily involved

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM OTHER ENTRIES ▪ Both companies will meet with a neutral third party to resolve the disagreement. EXAMPLES FROM CORPUS ▪ Is it lawful to refer questions of fact and law to a third party to determine in a non-judicial fashion? ▪ It also ...

Wiktionary Word definitions in Wiktionary
n. 1 someone not directly involved in a transaction. A third entity in the Seller (first party) and Customer (second party) relationship. A Seller may employ a third party to perform specific services to augment the value of a product. For example, a manufacturer ...

Wikipedia Word definitions in Wikipedia
In Canada, a third party has two distinct meanings in the political process. For legal and official purposes, a "third party" refers to agents other than candidates and voters who participate in elections. For example, campaign advertisements funded by ...

WordNet Word definitions in WordNet
n. someone other than the principals who are involved in a transaction a political party organized in opposition to the major parties in a two-party system