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English definition of “button”

button

noun [C]     /ˈbʌtən/
COMMUNICATIONS, IT a small , often circular object which you press to operate a device or a machine , or an area on a computer screen which looks and works like one of these: press/hit/push a button Press the green button to start the machine and the red button to stop it.the send/save/delete button Always re-read your email messages carefully before you hit the send button.
MARKETING →  button ad
(Definition of button noun from the Cambridge Business English Dictionary © Cambridge University Press)
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