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button

noun [C] (ON MACHINE)
 
 
/ˈbʌt.ən/ US  /ˈbʌt̬-/

Definition

B1 a small, sometimes circular object that you press to operate a device or a machine, or an area on a computer screen that looks and acts like one of these: He inserted the disk and pressed the "play" button.Electrical switches and connections
(Definition of button noun (ON MACHINE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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