callback
word
Definition
A callback is a return phone call made after a previous contact, especially when a call was missed. In computing, it also means a function passed as a parameter that is executed after another function completes.
Usage & Nuances
'Callback' is formal in business and technical in programming. In phone/customer service, 'I'll arrange a callback' is common. In tech, 'callback function' is a fixed programming term. Not used for social/personal calls; don't confuse with 'call back' (the verb phrase).
Example Sentences
Just leave your number and the system will set up a callback as soon as someone is available.
natural
Many JavaScript libraries rely on the use of a callback to process data after a task completes.
natural
If you don't want to wait on hold, request a callback and they'll ring you back.
natural
I missed your call, so I scheduled a callback for tomorrow.
basic
The company offers a callback service if all agents are busy.
basic
We use a callback function in our program to handle the results.
basic