1. An ancient Tantric concept adopted by Theosophy and brought into contemporary occult thought. There are supposedly multiple bodies or sheaths that make up a person (anciently there were 5, but the Theosophists made this 7). The causal body is the highest, most ethereal body. It is a veil for the true soul.
2.Buddhi and Manas, the incarnating self. It is the Causal Body that is what is most identified as the “Soul,” although it is not the ultimate Spirit.