Definitions of staple:

• noun:   paper fastener consisting of a short length of U-shaped wire that can fasten papers together
• noun:   a short U-shaped wire nail for securing cables
• noun:   (usually plural) a necessary commodity for which demand is constant
• noun:   material suitable for manufacture or use or finishing
• verb:   secure or fasten with a staple or staples

  Example: "Staple the papers together"

• adjective:   necessary foods or commodities

  Example: "Wheat is a staple crop"

• name:  A surname (very rare: popularity rank in the U.S.: #21870)