The Collaborative International Dictionary of English v.0.48:

decor \decor\, d'ecor \d['e]cor\n. [Fr. d['e]cor, fr. d['e]corer
   to decorate, fr. L decorare. See decorate.]
   1. the layout, style, and furnishings of a livable interior.

   Syn: interior decoration.
        [WordNet 1.5 +PJC]

   2. Decoration[2].
      [PJC]

   3. (Theater) A stage setting. --MW10
      [PJC]

WordNet (r) 3.0 (2006):

decor
    n 1: decoration consisting of the layout and furnishings of a
         livable interior [syn: interior decoration, decor]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "decor":
   act drop, adjunct, adornment, arrangement, asbestos,
   asbestos board, backdrop, batten, border, cloth, color,
   color patterns, coulisse, counterweight, curtain, curtain board,
   cyclorama, decoration, drop, drop curtain, elaboration,
   embellishment, emblazonment, emblazonry, embroidery, fire curtain,
   flat, flipper, flourish, flower arrangement, furniture arrangement,
   garnish, garnishment, garniture, hanging, illumination, ornament,
   ornamentation, rag, scene, scenery, screen, side scene,
   stage screw, tab, tableau, teaser, tormentor, transformation,
   transformation scene, trim, trimming, window dressing, wing,
   wingcut, woodcut