Definition of "fiber"

(countable) A single elongated piece of a given material, roughly round in cross-section, often twisted with other fibers to form thread.  examples

(uncountable) A material in the form of fibers.  examples

(textiles) A material whose length is at least 1000 times its width.  examples

Dietary fiber.  examples

(figuratively) Moral strength and resolve.  examples

(mathematics) The preimage of a given point in the range of a map.  examples

(category theory) The pullback of a morphism along a global element (called the fiber of the morphism over the global element).  examples

(computing) A kind of lightweight thread of execution.  quotations  examples

(cytology) A long tubular cell found in bodily tissue.