Psychotherapy refers to the treatment of mental and emotional disorders through the use of psychological techniques designed to encourage communication of conflicts and insight into problems and through talking with a therapist, with the goal being personality growth and behavior modification.
Other /More definition:
Psychotherapy refers to the treatment of abnormal behavior through psychological techniques; the treatment of a behavior disorder, mental illness, or any other condition by psychological means
Lexicon of Psychology - Terms, Treatments, Biographies,