NOUN (3)

1. a unit of measurement for the fineness of silk or nylon or rayon;
- Example: "with an evening dress one wears 10 denier stockings"

2. any of various former European coins of different denominations;

3. one who denies;

The Collaborative International Dictionary of English v.0.48:

Denier \De*ni"er\, n.
   One who denies; as, a denier of a fact, or of the faith, or
   of Christ.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Denier \De*nier"\, n. [F. denier, fr. L. denarius a Roman silver
   coin orig. equiv. to ten asses, later, a copper, fr. deni ten
   by ten, fr. the root of decem ten; akin to E. ten. See Ten,
   and cf. Denary, Dinar.]
   A small copper coin of insignificant value.
   [1913 Webster]

         My dukedom to a beggarly denier.         --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

denier
    n 1: a unit of measurement for the fineness of silk or nylon or
         rayon; "with an evening dress one wears 10 denier
         stockings"
    2: any of various former European coins of different
       denominations
    3: one who denies