The term transpersonal is commonly used to describe experiences and worldviews that go beyond the personal level of the psyche (i.e. transcend the Ego), and beyond the ordinary phenomenal world of time and space.
Experiencing transpersonal events is often associated with expanded or non-ordinary (i.e. psychedelic) states of consciousness, cosmic experiences, self-exploration, feelings of Divine Unity, past-life events, peak experiences, and spiritual insights, to give some examples.
As such, Transpersonal Breathwork relates to those Breathwork modalities that enable us to experience transpersonal events. As a rule, they apply Conscious Connected Breathing techniques to induce transpersonal states of mind. Typically, Transpersonal Breathwork is likewise considered Transformational Breathwork.