(business, commerce) An individual or entity related to the first party in a business or transaction.

(cryptography) Synonym of Bob (“placeholder”)

(dated slang) An orgy.

National Socialist German Workers' Party

present participle of third-party

(neologism) A party held for a couple about to be married; a bachelorette party or bachelor party open to all guests, rather than those of a specific gender.

Any of the particular people's political parties.

A Euro-sceptic political party in the United Kingdom.

(Britain) a short radio or television broadcast made by a political party

(law, archaic) The party to a legal dispute against whom a complaint was initially raised in a court.