A woman, especially one who is young, who is known for her enthusiastic and frequent attendance of parties; a female party animal. / (euphemistic) A female prostitute.

(grammar) of, or relating to, the past participle

Participant in a mutual enterprise that resembles a partnership but may not have such a formal structure.

plural of partial vacuum

(mathematics) Any of several fractions to the sum of which a single fraction is equal.

plural of party school

(physics) A beam of atoms, ions or subatomic particles that has been accelerated by some device and collimated by magnets and/or electrostatic lenses

(colloquial) bachelor party

(computing) A social event based around a LAN (local area network) where participants engage in computer activities such as multiplayer gaming.

A criminal accomplice. / (informal, humorous) A close associate.