staple

(noun) (usually plural) a necessary commodity for which demand is constant. Synonyms: basic.

(noun) a natural fiber (raw cotton, wool, hemp, flax) that can be twisted to form yarn. Synonyms: staple fiber, staple fibre. Example: "Staple fibers vary widely in length."

(noun) material suitable for manufacture or use or finishing. Synonyms: raw material.

(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. Example: "Staple the papers together."

(adj) necessary or important, especially regarding food or commodities. Example: "Wheat is a staple crop."