1. • noun - (usually plural) a necessary commodity for which demand is constant
   • noun - a natural fiber (raw cotton, wool, hemp, flax) that can be twisted to form yarn
   • noun - material suitable for manufacture or use or finishing
   • noun - a short U-shaped wire nail for securing cables
   • noun - paper fastener consisting of a short length of U-shaped wire that can fasten papers together
   • verb - secure or fasten with a staple or staples
   • adj - necessary or important, especially regarding food or commodities
2. • A principal raw material or commodity grown or produced in a region.
   • A major item of trade in steady demand.
   • A basic dietary item, such as flour, rice, or corn.
   • A basic or principal element or feature.
   • The fiber of cotton, wool, or flax, graded as to length and fineness.
   • Produced or stocked in large quantities to meet steady demand: Wheat is a staple crop.
   • Principal; main: a staple topic of conversation.
   • A U-shaped metal loop with pointed ends, driven into a surface to hold a bolt, hook, or hasp or to hold wiring in place.
   • A thin piece of wire in the shape of a square bracket that is driven by a device through sheets of paper or similar material and flattened to serve as a fastening.
3. • v - to fasten by means of a U-shaped metal loop

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