Wordnet 3.0
NOUN (2)
1. 
 an Italian title of address equivalent to Mrs. when used before a name; 
2. 
 an Italian title or form of address for a married woman; 
The Collaborative International Dictionary of English v.0.48:
Signora \Si*gno"ra\, n. [It.]
   Madam; Mrs; -- a title of address or respect among the
   Italians.
   [1913 Webster]
WordNet (r) 3.0 (2006):
signora
    n 1: an Italian title of address equivalent to Mrs. when used
         before a name
    2: an Italian title or form of address for a married woman
Moby Thesaurus II by Grady Ward, 1.0:
20 Moby Thesaurus words for "signora":
   Frau, Fraulein, Miss, Mistress, Mlle, Mme, Mmes, dame, dona, donna,
   lady, madam, madame, mademoiselle, mem-sahib, mesdames, senhora,
   senhorita, signorina, vrouw