A small, typically round object used to fasten clothing by fitting through a hole or loop. She sewed a new button onto her coat after the old one fell off.
A small, often circular, object on a device that is pressed to operate it. He pressed the button to start the coffee machine.
A badge or pin worn on clothing, often displaying a slogan or image. She wore a campaign button to show her support for the candidate.
A graphical element on a computer screen that can be clicked to perform a function. Click the 'Submit' button to send your form.