Definitions from Wiktionary ( )

▸ noun:  A knob or disc that is passed through a loop or (buttonhole), serving as a fastener.
▸ noun:  A mechanical device meant to be pressed with a finger in order to open or close an electric circuit or to activate a mechanism.
▸ noun:  (graphical user interface) An on-screen control that can be selected as an activator of an attached function.
▸ noun:  (US) A badge worn on clothes, fixed with a pin through the fabric.
▸ noun:  (botany) A bud.
▸ noun:  The head of an unexpanded mushroom.
▸ noun:  (slang) The clitoris.
▸ noun:  (curling) The center (bullseye) of the house.
▸ noun:  (fencing) The soft circular tip at the end of a foil.
▸ noun:  (poker) A plastic disk used to represent the person in last position in a poker game; also dealer's button.
▸ noun:  (poker) The player who is last to act after the flop, turn and river, who possesses the button.
▸ noun:  (archaic) A person who acts as a decoy.
▸ noun:  A raised pavement marker to further indicate the presence of a pavement-marking painted stripe.
▸ noun:  (aviation) The end of a runway.
▸ noun:  (South Africa, slang) A methaqualone tablet (used as a recreational drug).
▸ noun:  A piece of wood or metal, usually flat and elongated, turning on a nail or screw, to fasten something, such as a door.
▸ noun:  A globule of metal remaining on an assay cupel or in a crucible, after fusion.
▸ noun:  A knob; a small ball; a small, roundish mass.
▸ noun:  A small white blotch on a cat's coat.
▸ noun:  (UK, archaic) A unit of length equal to ¹⁄₁₂ inch.
▸ noun:  (generally with the) The means for initiating a nuclear strike or similar cataclysmic occurrence.
▸ noun:  (glassblowing) The oblate spheroidal mass of glass attaching a stem to either its bowl or foot.
▸ noun:  (lutherie) In an instrument of the violin family, the near-semicircular shape extending from the top of the back plate of the instrument, meeting the heel of the neck.
▸ noun:  (lutherie) Synonym of endbutton, part of a violin-family instrument.
▸ noun:  (lutherie, bowmaking) Synonym of adjuster.
▸ noun:  The least amount of care or interest; a whit or jot.
▸ noun:  (television) The punchy or suspenseful line of dialogue that concludes a scene.
▸ noun:  (comedy) The final joke at the end of a comedic act (such as a sketch, set, or scene).
▸ noun:  (slang) A button man; a professional assassin.
▸ noun:  The final segment of a rattlesnake's rattle.
▸ noun:  (dated, Southern US) A clove (of garlic).
▸ noun:  (zoology) Pedicle; the attachment point for antlers in cervids.
▸ verb:  (transitive) To fasten with a button.
▸ verb:  (intransitive) To be fastened by a button or buttons.
▸ verb:  (informal) To stop talking.
▸ noun:  A surname originating as an occupation for a maker or seller of buttons.
▸ noun:  A township in Ford County, Illinois, United States.
▸ noun:  Alternative form of Buton (“Indonesian island”) [An island in Indonesia located off the southeast peninsula of Sulawesi.]

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