noun

• (countable) A single piece of a given material, elongated and roughly round in cross-section, often twisted with other fibres to form thread.
• (uncountable) Material in the form of fibres.
• Dietary fibre.
• Moral strength and resolve.
• (mathematics) The preimage of a given point in the range of a map.
• (category theory) Said to be of a morphism over a global element: The pullback of the said morphism along the said global element.
• (computing) A kind of lightweight thread of execution.
• (cytology) A long tubular cell found in bodily tissue.