The Collaborative International Dictionary of English v.0.48:

Aroma \A*ro"ma\, n. [L. aroma, Gr. ?: cf. OE. aromaz, aromat,
   spice, F. aromate.]
   1. The quality or principle of plants or other substances
      which constitutes their fragrance; agreeable odor; as, the
      aroma of coffee.
      [1913 Webster]

   2. Fig.: The fine diffusive quality of intellectual power;
      flavor; as, the subtile aroma of genius.
      [1913 Webster] Aromatic

WordNet (r) 3.0 (2006):

aroma
    n 1: any property detected by the olfactory system [syn:
         olfactory property, smell, aroma, odor, odour,
         scent]
    2: a distinctive odor that is pleasant [syn: aroma,
       fragrance, perfume, scent]

Moby Thesaurus II by Grady Ward, 1.0:

89 Moby Thesaurus words for "aroma":
   atmosphere, attribute, aura, badge, balm, balminess, bouquet,
   brand, breath, cachet, cast, character, characteristic,
   configuration, cut, definite odor, detectable odor, differentia,
   differential, distinctive feature, earmark, effluvium, emanation,
   essence, exhalation, feature, fetor, figure, flavor, fragrance,
   fragrancy, fruitiness, fume, gust, hallmark, hint, idiocrasy,
   idiosyncrasy, impress, impression, incense, index, individualism,
   keynote, lineaments, mannerism, mark, marking, mephitis, mold,
   muskiness, nature, nosegay, odor, particularity, peculiarity,
   perfume, property, quality, quirk, redolence, reek, savor, scent,
   seal, shape, singularity, smack, smell, specialty, spice,
   spiciness, spoor, stamp, stench, stink, subtle odor, suggestion,
   sweet savor, sweet smell, taint, tang, taste, token, trace, trail,
   trait, trick, whiff