The Collaborative International Dictionary of English v.0.48:

Donna \Don"na\, n. [It. donna, L. domina. See Don, Dame.]
   A lady; madam; mistress; -- the title given a lady in Italy.
   [1913 Webster]

WordNet (r) 3.0 (2006):

donna
    n 1: an Italian woman of rank

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "donna":
   Eve, Frau, Fraulein, Miss, Mistress, Mlle, Mme, Mmes, dame,
   daughter of Eve, distaff, domina, dona, dowager, femme, frow,
   gentlewoman, girl, lady, lass, madam, madame, mademoiselle, matron,
   mem-sahib, mesdames, milady, senhora, senhorita, signora,
   signorina, squaw, vrouw, wahine, weaker vessel, woman



U.S. Gazetteer Places (2000):

Donna, TX -- U.S. city in Texas
   Population (2000):    14768
   Housing Units (2000): 5734
   Land area (2000):     5.041082 sq. miles (13.056343 sq. km)
   Water area (2000):    0.010756 sq. miles (0.027857 sq. km)
   Total area (2000):    5.051838 sq. miles (13.084200 sq. km)
   FIPS code:            20884
   Located within:       Texas (TX), FIPS 48
   Location:             26.170336 N, 98.049037 W
   ZIP Codes (1990):     78537
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Donna, TX
    Donna