psychotherapyPronunciation: /sʌɪkə(ʊ)ˈθɛrəpi/Translate psychotherapy | into German | into Spanish Definition of psychotherapy noun [mass noun] the treatment of mental disorder by psychological rather than medical means. Derivatives psychotherapeuticPronunciation: /-ˈpjuːtɪk/ adjective psychotherapist noun psychotherapy in other Oxford dictionaries Definition of psychotherapy in the US English dictionary