staple (Noun) — (usually plural) a necessary commodity for which demand is constant.
staple (Noun) — A natural fibre (raw cotton, wool, hemp, flax) that can be twisted to form yarn. ex. "staple fibers vary widely in length"
staple (Noun) — Material suitable for manufacture, use or finishing.
staple (Noun) — A short U-shaped wire nail for securing cables.
staple (Noun) — Paper fastener consisting of a short length of U-shaped wire that can fasten papers together.
staple (Verb) — Secure or fasten with a staple or staples. ex. "staple the papers together"
staple (Adjective) — Necessary or important, especially regarding food or commodities. ex. "wheat is a staple crop"