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From French fibre, from Old French, from Latin fibra

Full definition of fiber

(plural fibers)

(countable) A single elongated piece of a given material, roughly round in cross-section, often twisted with other fibers to form thread.The microscope showed a single blue fiber stuck to the sole of the shoe.
(uncountable) A material in the form of fibers.The cloth is made from strange, somewhat rough fiber.
(textiles) A material whose length is at least 1000 times its width.Please use polyester fiber for this shirt.
Dietary fiber.''Fresh vegetables are a good source of fiber
(figuratively) Moral strength and resolve.The ordeal was a test of everyone's fiber.
(mathematics) The preimage of a given point in the range of a map.''Under this map, any two values in the fiber of a given point on the circle differ by 2π
(computing) A kind of lightweight thread of execution.