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3 definitions found
 for callback
From The Collaborative International Dictionary of English v.0.48 :

  call-back \call-back\ n.
     1. a return call, especially a telephone call.
        [WordNet 1.5]
  
     2. the recall of an employee to work after a layoff.
        [WordNet 1.5]

From WordNet (r) 3.0 (2006) :

  callback
      n 1: a request by the manufacturer of a defective product to
           return the product (as for replacement or repair) [syn:
           recall, callback]

From The Free On-line Dictionary of Computing (30 December 2018) :

  callback
  
     1.  A scheme used in event-driven programs
     where the program registers a subroutine (a "callback
     handler") to handle a certain event.  The program does not
     call the handler directly but when the event occurs, the
     run-time system calls the handler, usually passing it
     arguments to describe the event.
  
     2.  A user authentication scheme
     used by some computers running dial-up services.  The user
     dials in to the computer and gives his user name and
     password.  The computer then hangs up the connection and
     uses an auto-dial modem to call back to the user's
     registered telephone number.  Thus, if an unauthorised person
     discovers a user's password, the callback will go, not to him,
     but to the owner of that login who will then know that his
     account is under attack.
  
     However, some PABXs can be fooled into thinking that the
     caller has hung up by sending them a dial tone.  When the
     computer tries to call out on the same line it is not actually
     dialing through to the authorised user but is still connected
     to the original caller.
  
     3.  cost control callback.
  
     (2003-07-13)
  

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