'denier' originates from Old French, specifically the word 'denier', where it referred to a small coin or unit of weight.

'denier' changed from the Old French word 'denier' and eventually became the modern English word 'denier'.

Initially, it meant 'a small coin or unit of weight', but over time it evolved into its current meanings of 'a person who denies' and 'a unit of measurement for fibers'.