Meaning of “party” - Learner’s Dictionary

party

noun [ C ] uk us /ˈpɑːti/
EVENT

A1 an event where people enjoy themselves by talking, eating, drinking, and dancing:

a birthday party
We're having a party to celebrate the occasion.
POLITICS

B1 an organization that shares the same political beliefs and tries to win elections:

a political party
GROUP

a group of people who are working or travelling together:

a party of tourists

(Definition of “party noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)