Source : Webster's Revised Unabridged Dictionary (1913)

Signorina \Si`gno*ri"na\, n. [It.]
   Miss; -- a title of address among the Italians.

Source : WordNet®

signorina
     n : an Italian courtesy title for an unmarried woman; equivalent
         to Miss with used before a name
     [also: {signorine} (pl)]