buttonfunction
nounUK /ˈbʌtən ˈfʌŋkʃən/
US /ˈbʌtən ˈfʌŋkʃən/
A button function is the job a button does when you press it.
The button function on this toy makes it play a song.
OTHER MEANINGS
2. The specific action assigned to a button in a computer program or app.
The developer changed the button function so it now saves the file instead of closing it.
3. The role a physical button plays on a device, such as turning it on or off.
The power button function is to switch the machine on and off.
4. A feature that lets you trigger a command by pressing a button.
This app has a button function that lets you take a photo quickly.