Definition of "denier"

denier¹

/dəˈnɪə(ɹ)/

noun
plural deniers
1. (now historical) An old French coin worth one-twelfth of a sou.
  Quotations
  A bronze denier bearing the inscription CONRADUS around a central cross, was minted in Lugdunum.
  2011, Norman Davies, Vanished Kingdoms, Penguin, published 2012, page 117
2. A unit of linear density which indicates the fineness of fiber or yarn, equal to one gram per 9000 meters, used especially to measure or indicate the fineness of hosiery. Originally equal to the weight of a denier coin per 9600 aunes.
  Quotations
  Upstairs she rummaged through her chest of drawers, finally unearthing an unopened pack of ten denier barely blacks.
  2002, Jill Mansell, Staying at Daisy's

denier²

/dɪˈnaɪə(ɹ)/

noun
plural deniers
1. One who denies or forbids something.
  Quotations
  Also, visitation deniers don't always get off with a slap on the wrist.
  2003, ABA Journal, volume 89
2. One who denies the existence of something.