According to Wikipedia the definition of DBT is as follows:
Dialectical behavior therapy (DBT) is an evidence-based[1] psychotherapy that began with efforts to treat personality disorders and interpersonal conflicts.[1] Evidence suggests that DBT can be useful in treating mood disorders and suicidal ideation as well as for changing behavioral patterns such as self-harm and substance use.[2] DBT evolved into a process in which the therapist and client work with acceptance and change-oriented strategies and ultimately balance and synthesize them—comparable to the philosophical dialectical process of thesis and antithesis, followed by synthesis.[1]
Source: Dialectical behavior therapy - Wikipedia