a disc or knob of plastic, wood, etc, attached to a garment, etc, usually for fastening two surfaces together by passing it through a buttonhole or loop

a small round object, such as any of various sweets, decorations, or badges

a small disc that completes an electric circuit when pushed, as one that operates a doorbell or machine

a symbolic representation of a button on the screen of a computer that is notionally depressed by manipulating the mouse to initiate an action

any rounded knoblike part or organ, such as an unripe mushroom

the protective knob fixed to the point of a foil

a small amount of metal, usually lead, with which gold or silver is fused, thus concentrating it during assaying

the piece of a weld that pulls out during the destructive testing of spot welds

a projection around the loom of an oar that prevents it slipping through the rowlock

an object of no value (esp in the phrase not worth a button)

intellect; mental capacity (in such phrases as a button short, to have all one's buttons , etc)

to fasten with a button or buttons

to provide with buttons

to hit (an opponent) with the button of one's foil