Source : Webster's Revised Unabridged Dictionary (1913)

Therapy \Ther"a*py\, n. [Gr. ?.]
   Therapeutics.

Source : WordNet®

therapy
     n : (medicine) the act of caring for someone (as by medication
         or remedial training etc.); "the quarterback is
         undergoing treatment for a knee injury"; "he tried every
         treatment the doctors suggested"; "heat therapy gave the
         best relief"