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]