/kawl"bak'/ , 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.
7. of or pertaining to such a call: Please leave a callback number.
Also, call-back .
[ 1925-30; n. use of v. phrase call back ]