Source : Webster's Revised Unabridged Dictionary (1913)

Inamorata \In*a`mo*ra"ta\, n. [It. innamorata, fem., innamorato,
   masc., p. p. of innamorare to inspire with love. See
   {Enamor}.]
   A woman in love; a mistress. ``The fair inamorata.''
   --Sherburne.

Source : WordNet®

inamorata
     n : a woman with whom you are in love or have an intimate
         relationship