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

(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.

In a piece of machinery with multiple parts, a part that is not powered to move.

Part of a machine that is powered to move. / (figuratively, chiefly in the plural) One of the variables or components in a complex situation.

Alternative spelling of mouthpart

plural of part-timer