Real Dictionary

psychotherapy
uncountable noun: Psychotherapy is the use of psychological methods in treating people who are mentally ill, rather than using physical methods such as drugs or surgery.

psychotherapy in American English
treatment of mental disorder by any of various means involving communication between a trained person and the patient and including counseling, psychoanalysis, etc.
noun: the treatment of psychological disorders or maladjustments by a professional technique, as psychoanalysis, group therapy, or behavioral therapy

psychotherapy in British English
noun: the treatment of mental illness by psychological methods