staple
adjective
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necessary or important, especially regarding food or commodities“wheat is a staple crop”
noun
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(usually plural) a necessary commodity for which demand is constantbasic
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paper fastener consisting of a short length of U-shaped wire that can fasten papers together
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a short U-shaped wire nail for securing cables
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material suitable for manufacture or use or finishingraw material
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a natural fiber (raw cotton, wool, hemp, flax) that can be twisted to form yarn“staple fibers vary widely in length”staple fiberstaple fibre
verb
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secure or fasten with a staple or staples“staple the papers together”