Source : Webster's Revised Unabridged Dictionary (1913)

Facet \Fac"et\, n. [F. facette, dim. of face face. See {Face}.]
   1. A little face; a small, plane surface; as, the facets of a
      diamond. [Written also {facette}.]

   2. (Anat.) A smooth circumscribed surface; as, the articular
      facet of a bone.

   3. (Arch.) The narrow plane surface between flutings of a
      column.

   4. (Zo["o]l.) One of the numerous small eyes which make up
      the compound eyes of insects and crustaceans.

Facet \Fac"et\, v. t. [imp. & p. p. {Faceted}; p. pr. & vb. n.
   {Faceting}.]
   To cut facets or small faces upon; as, to facet a diamond.

Source : WordNet®

facet
     n 1: a distinct feature or element in a problem; "he studied
          every facet of the question" [syn: {aspect}]
     2: a smooth surface (as of a bone or cut gemstone)
     [also: {facetting}, {facetted}]