Of or pertaining to two or more political parties.

(informal) One who dampens fun; especially, one who declines to participate in or enjoy a party or some other group activity; one who does not agree with the opinions of a group.

(grammar) Any participle used as a dangling modifier.

A dangling participle.

(dated) atomic theory

One who partakes of something. / A partner or accomplice.

(physics) The study of the motion of individual particles.

A group of people assembled to carry out a military attack.

(physics) The sum of a particle's potential energy and kinetic energy

Politics that is dominated by rivalry between political parties