callback

noun

1. The return of a situation to a previous position or state; a reference to such a position or state.

   “Aiden Gillen whimpers on his knees, stretching for the first time in years. And finally Sansa sentences him, and Arya swings the sword, or dagger as the case may be. For all the historical callbacks in the episode, and in its old age Game Of Thrones keeps portentously reciting old lines verbatim, this callback is the most resonant. Ned always said the man who passes the sentence should swing the sword. His daughters are finding a different way forward.”

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

   “For example, multiple callbacks might be made to a nonanswered number to increase the response rate.”

3. A product recall because of a defect or safety concern.
4. A function pointer passed as an argument to another function.

   “Historically, all viable frameworks have always provided a mechanism to implement callbacks. C# goes one step further and encapsulates callbacks into callable objects called delegates.”

5. A follow-up audition in casting.
6. A follow-up interview in employment recruiting.
7. A joke which references an earlier joke in the same routine.
8. A form of audience participation in which the audience shout lines in response to the dialog of a film.

   “Apparent on this disc is the problem that plagues every recording of the score: Without an audience full of rowdy geeks screaming out callbacks, Rocky Horror feels incomplete.”