1. (n.)button a small disk, knob, or the like attached to an article, as of clothing, and serving as a fastener when passed through a buttonhole or loop.
2. button anything resembling a button, esp. in beingsmall and round, as a candy, ornament, or marker.
3. button a badge or emblembearing a name, slogan, or the like, for wear on the lapel, dress, etc.: campaign buttons.
4. button a smallknob or disk pressed to activate an electric circuit, operate a machine, open a door, etc.
1. (noun)button a roundfastener sewn to shirts and coats etc to fit through buttonholes
2. (noun)push button, push, button an electrical switch operated by pressing "the elevator was operated by push buttons"; "the push beside the bed operated a buzzer at the desk"
3. (noun)button any of various plantparts that resemble buttons
4. button (right) on the button exactly or exactly right Got there at 10:00, on the button.
Definition of 'Button'
Webster Dictionary
1. (noun)Button a knob; a small ball; a small, roundish mass
2. (noun)Button a catch, of various forms and materials, used to fasten together the different parts of dress, by being attached to one part, and passing through a slit, called a buttonhole, in the other; -- used also for ornament