Pronunciation: (kôl'bak"),[key] —n. 1. an act of calling back.
2. a summoning of workers back to work after a layoff.
3. a summoning of an employee back to work after working hours, as for emergency business.
4. a request to a performer who has auditioned for a role, booking, or the like to return for another audition.
5. recall (def. 12).
6. a return telephone call.
—adj. of or pertaining to such a call: Please leave a callback number.Also,call'-back".