third party

1. 1.

   someone other than the principals who are involved in a transaction

   Broaderarbiter
2. 2.

   a political party organized in opposition to the major parties in a two-party system

   Broaderparty

Questions about third party

What does third party mean?

third party means "someone other than the principals who are involved in a transaction". That is the primary sense; the word has 2 in total, listed in full on this page.

Is third party a common word?

third party is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.