1. [noun] A knob or disc that is passed through a loop or (buttonhole), serving as a fastener. [from the mid-13th c.]
2. [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.
3. [noun] (graphical user interface) An on-screen control that can be selected as an activator of an attached function.
4. [noun] (US) A badge worn on clothes, fixed with a pin through the fabric.
5. [noun] (botany) A bud.
6. [noun] (slang) The clitoris.
7. [noun] (curling) The center (bullseye) of the house.
8. [noun] (fencing) The soft circular tip at the end of a foil.
9. [noun] (poker) A plastic disk used to represent the person in last position in a poker game; also dealer's button.
10. [noun] (poker) The player who is last to act after the flop, turn and river, who possesses the button.
11. [noun] A raised pavement marker to further indicate the presence of a pavement marking painted stripe.
12. [noun] (South Africa) (slang) A methaqualone tablet (used as a recreational drug).
13. [noun] A piece of wood or metal, usually flat and elongated, turning on a nail or screw, to fasten something, such as a door.
14. [noun] A globule of metal remaining on an assay cupel or in a crucible, after fusion.
15. [noun] A knob; a small ball; a small, roundish mass.
16. [noun] A small white blotch on a cat's coat.
17. [noun] (UK) (archaic) A unit of length equal to 1/12 of an inch.
18. [verb] (transitive) To fasten with a button. [from the late 14th c.]
19. [verb] (intransitive) To be fastened by a button or buttons.
20. [noun] A round fastener sewn to shirts and coats etc to fit through buttonholes.
21. [noun] An electrical switch operated by pressing; 'the elevator was operated by push buttons'; 'the push beside the bed operated a buzzer at the desk'.
22. [noun] Any of various plant parts that resemble buttons.
23. [noun] A round flat badge displaying information and suitable for pinning onto a garment; 'they passed out campaign buttons for their candidate'.
24. [noun] A female sexual organ homologous to the penis.
25. [noun] A device that when pressed will release part of a mechanism.
26. [noun] Any artifact that resembles a button.
27. [verb] Provide with buttons; 'button a shirt'.
28. [verb] Fasten with buttons; 'button the dress'.
