callback

1. (telephony) A return telephone or radio call; especially one made automatically to authenticate a logon to a computer network.Examples: "For example, multiple callbacks might be made to a nonanswered number to increase the response rate."

2. (programming) A function pointer passed as an argument to another function.Examples: "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."

3. (theater) A follow-up audition in casting.

4. (business) A follow-up interview in employment recruiting.

5. (comedy) A joke which references an earlier joke in the same routine.Examples: "When the album succeeds, such as on the swaggering, Queen-esque “Nothing’s Gonna Stop Us,” it does so on The Darkness’ own terms—that is, as a random ’80s-cliché generator. But with so many tired, lazy callbacks to its own threadbare catalog (including “Love Is Not The Answer,” a watery echo of the epic “I Believe In A Thing Called Love” from 2003’s Permission To Land), Hot Cakes marks the point where The Darkness has stopped cannibalizing the golden age of stadium rock and simply started cannibalizing itself. And, despite Hawkins’ inveterate crotch-grabbing, there was never that much meat there to begin with."Synonyms: running gag