party (parties plural & 3rd person present) (partying present participle) (partied past tense & past participle )
1 n-count A party is a political organization whose members have similar aims and beliefs. Usually the organization tries to get its members elected to the government of a country.
...a member of the Labour party.
2 n-count A party is a social event, often in someone's home, at which people enjoy themselves doing things such as eating, drinking, dancing, talking, or playing games.
The couple met at a party...
3 verb If you party, you enjoy yourself doing things such as going out to parties, drinking, dancing, and talking to people.
They come to eat and drink, to swim, to party. Sometimes they never go to bed... V
4 n-count A party of people is a group of people who are doing something together, for example travelling together.
They became separated from their party.
5 n-count One of the people involved in a legal agreement or dispute can be referred to as a particular party. (LEGAL)
It has to be proved that they are the guilty party.
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third party
6 Someone who is a party to or is party to an action or agreement is involved in it, and therefore partly responsible for it.
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be a party to sth/be party to sth phrase
Crook had resigned his post rather than be party to such treachery.