denier /dəˈnɪə(ɹ)/noun 2/dɪˈnaɪə(ɹ)/ noun 2forms 1 noun2 •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.Upstairs she rummaged through her chest of drawers, finally unearthing an unopened pack of ten denier barely blacks. — 2002 •(historical) An old French coin worth one-twelfth of a sou.A bronze denier bearing the inscription CONRADUS around a central cross, was minted in Lugdunum. — 2011 denier /dɪˈnaɪə(ɹ)/ noun2 •One who denies or forbids something.Also, visitation deniers don't always get off with a slap on the wrist. — 2003 •One who denies the existence of something.“Robert F. Kennedy, Jr. is not an environmentalist. He is a dangerous conspiracy theorist and science denier whose agenda would be a disaster for our communities and the planet,” the letter reads. — 2024 formsdeniers