- an act of calling back.
- a summoning of workers back to work after a layoff.
- a summoning of an employee back to work after working hours, as for emergency business.
- a request to a performer who has auditioned for a role, booking, or the like to return for another audition.
- recall(def 12).
- a return telephone call.
- of or relating to such a call: Please leave a callback number.