The return of a situation to a previous position or state.

(telephony) A return telephone or radio call; especially one made automatically to authenticate a logon to a computer network.

A product recall because of a defect or safety concern.

(programming) A function pointer passed as an argument to another function.

(theater) A follow-up audition in casting.

(comedy) A joke which references an earlier joke in the same routine.

A form of audience participation in which the audience shout lines in response to the dialog of a film.