ETYM Old Eng. boton, botoun, French bouton button, bud, prop. something pushing out, from bouter to push. Related to Butt an end.
1. Any of various plant parts that resemble buttons.
2. Sewn to shirts and coats etc to fit through buttonholes.

1. A graphic element in a dialog box that, when activated, performs a specified function. The user activates a button by clicking on it with a mouse or, if the button has the focus, by hitting the Return or Enter key.
2. On a mouse, a movable piece that is pressed to activate some function. Older mouse models have only one button; newer models typically have two or more buttons.

1. To fasten with buttons.
2. To provide with buttons.