An integral or essential piece; that which must be done or accepted as part of something else.

(anatomy) Any part of an animal organism, such as an organ, limb or extremity. / Any part of the body of a vehicle.

A component of any manufactured goods, kept in reserve to replace one that fails; a spare.

plural of bit part

(law) Of, relating to, or characteristic of a proceeding where one of the involved parties is not present. / Concerning only one side of a matter; one-sided.

(law) In the manner of a proceeding where one of the involved parties is not (or sometimes may not be) present.

(music) A form of unaccompanied, often homophonic, vocal composition usually for a few voices or a small choir

Alternative spelling of part song

(idiomatic) An insult or barbed comment issued as the speaker departs or the conversation comes to an end.

plural of nonmoving part